It’s a story that began 20000 years ago, and has been waiting for you. Like something out of a “Star Trek” episode. The vista before you hangs in the black like a portal into the fiery underbelly of all that’s good in the Universe.
“Star Trek” You remember it now. The Battle of Wolf-359. It was a classic episode, in which a tattered human military force took on a vastly superior foe: the Borg. These creatures were bloodless and implacable. Truly unsettling bad guys.
This monster is just as unsettling. Wolf-Rayet-124 is real. It’s huge. You’ve come a long way to encounter it. A small fleet of drone-sats has been dispatched to get up close and personal with this Wolf-Rayet star, to see how extreme extreme sports can get.
As soon as humans got comfortable in space and started calling all kinds of dark corners and odd rocks home they were up to their usual mischief. As soon as all the laws were decreed and the soapboxes were all put away, humans got back to the serious business of finding new and bizarre ways to enjoy themselves.
Space tourism didn’t become big business. It became exponentially big business. Extreme sports fans weren’t interested in scuba diving with great white sharks anymore, or parachuting.
Ha! You recall the stories. The One-G-ers were those quaint old extreme sportsters who couldn’t let go of old mother earth. Most of them were toothless and half nuts decades ago, but they still harped on about climbing Mount Everest or wrestling crocodiles.
You look upon Wolf-124, blazing with a luminosity several million times greater than Earths sun back home. Wolf-124 is huge. How huge? These kinds of stars are rare. Of the millions of stars known to humanity only around 500 Wolf-Rayet stars are known to exist in this galaxy.
Wolf-Rayet stars are thought to be the powerhouses driving many planetary nebula or stellar nurseries. How does this work?
Your little drone sats are tasting the cloud of ionised gas and interstellar gunk that swirls around the star. This cloud is nearly 6 light years across; a dusty miasma flung outwards by the intense solar winds radiating from the star within. From your vantage point out here, looking down into this slow maelstrom you see chunks of the star heading outward. Earth sized pieces of WR-124 soar through the cloud like the volcanic rage of a demon tearing itself apart.
You write that last line down. The tourists will love it.
Sometime around 20000 years ago, when human beings were first discovering Europe WR-124 began tearing itself apart. Scientists never really ascertained why, but it’s made for some great observations over the years. Tourists will love this. You got here first, to set up the first fleet of solar sailing yachts. The winds from the star crack along at 1600 km per second, fast enough to twist the most iron stomachs.
These stars have unusual emission spectra. Many of the space tourists won’t care what this is, but there’s always someone in every group who just has to understand what they’re leaping into. Fair enough. What it means is that like any other star a Wolf-Rayet star burns up fuel. Our star, a relatively youthful star somewhere near middle age, is still burning hydrogen via the process of stellar fusion. As a star ages it’s supply of hydrogen becomes depleted, and it must burn heavier elements in order to survive.Wolf-Rayet stars are often seen to have high levels of quite heavy elements or “metals” such as carbon or nitrogen in their upper atmosphere. This is due to nearly complete depletion of hydrogen fuel so as a result heavier elements are being used up.
What does this have to do with spectra? Well, as elements transition from higher to lower energy states, ie when they’re being burned up inside a star, photons of particular wavelenghts are given off. It’s possible to tell just by analysing the wavelengths of light radiating from a star (it’s emmision spectra) what’s going on in and immediately around the star. This is why scientists know WR stars are old, and what they’re burning off in place of hydrogen. It’s also the reason they can infer the presence of extreme solar winds. The luminosity and heat given off by a WR star is extreme. At it’s surface a WR star can reach temperatures of between 30000 and 200000 Kelvin; hotter by far than most other stars. Such radiative pressure literally manifests as a “wind”, with the abilty to exert pressure on objects, such as solar sails!
Most of the drone sats are keeping a safe distance from WR-124. This might just be an imaginary blog post, but you have imaginary operating costs, you know?
So you’ve staked your claim here. Now, all that’s left to do is wait for the money to fly in!
Still, you’re thinking of your next venture. There’s an exoplanet out there somewhere: HD 189733B where it rains glass! Now that sounds like fun…..
While you’re here, join me on the AstroBiological YouTube channel. I’m hard at work sprucing it up. What do you think of this intro sequence?
One last thing!
Hop onto WeCreateEdu: an online community for educational you tubers. There is a galaxy of stuff to learn and explore here. Very much worth a look:
A few months ago I was watching a YouTube video which steered me towards the topic of this post. I am a (very small time) youtuber myself, and spend a lot of time looking for ways to tweak my content and make it more polished. The YouTube video mentioned above was made using screen capture software and the simulation package Universe Sandbox. The video featured all kinds of hypothetical scenarios being imagined and allowed to play out within the simulation. For example, the questions were asked: what if Saturn was moved closer to the sun? What if Earth passed through its rings on this inward journey? What if Saturn and Jupiter made a close approach to each other?
It was fascinating to watch. Simulating actual physics and real world parameters you could see what actually could happen if such scenarios actually took place. It got me thinking about my own video content, and about these simulation software packages. I of course had to get my hands on some!
Currently I am producing videos using both my laptop and my smartphone. In this post I will focus on the capabilities of a smartphone to produce videos about outer space.
Animations for this video were produced entirely on my smart phone, using several apps available on Google Play. My phone is an Android device, but I’m assuming there are equivalents over at the enemy camp.
First off, these apps are great educational tools. Perhaps where they are the most effective is getting people to explore from the palm of their hand. In this device obsessed era this is a big deal and also a drawcard for the digit generation. This video explores some mobile apps I’ve been using for my YouTube channel. It’s really amazing what you can do with amazing most nothing! I’ll also include a video about Uranus. All of the planetary animations came from mobile apps.
The Uranus video:
Here is another earlier video briefly introducing the moons of Mars…
And in this one I discuss Enceladus and some promising signs of habitability there:
These videos were extremely easy to make and perhaps the point of this post is that anyone can communicate something they care about. Enjoy!
Hi all. It’s been a while I’m ashamed to admit. I’ve been working on a new Facebook group to raise the profile of my channel. It’s been fun. Here is the link (hint: join the group!)
Here is my newest video. A basic breakdown of what exactly the Goldilocks (or circumstellar habitable) zone is, and it’s importance to life on Earth. If you like the channel please subscribe!
I’ve also provided the script/transcript for my upcoming episode of “Astro-Biological:”, which introduces us to the concept of the Goldilocks Zone….
G’day! Welcome to Astro-biological:!
Ben what the heck are you talking about? What’s the connection?
Let’s go check out THE GOLDILOCKS ZONE!!!!
Life, as I like to remind you, is really special. Here on earth, life exists only because certain conditions are met. Today, we’ll consider water. Everything needs it, but it only exists as a liquid at the surface here on Earth.
So? Big deal right?
Well it is actually!
Check out the sun. Giver of life! Driver of climate! Pumping out some pretty respectable energy. How much?
1 yottawatt equals 10 with 26 zeroes after it!
Brutal! And the sun is a pretty average star! Nothing special about it!So there’s plenty of sunlight for everyone!
Could other planets benefit from the sun’s golden goodness the way we do? Let’s take a look at the inner planets. They’re the only ones that really matter in all this…
Let’s see…Mercury, Venus, Earth and Mars. The rocky planets. The so called “Terrestrial Planets”.
Mercury is 58 million kilometres from the sun. That’s really close. This close proximity has turned Mercury’s surface into an oven, where liquid water couldn’t possibly last.
Let’s visit the next in line: Venus. Venus is similar to Earth in composition, gravity and size. Long ago Venus might have had oceans just like Earth, but again the planets closeness to the sun and other factors saw all that water disappear into space. Venus is now the hottest place in the solar system. Definitely no liquid water there anymore!
Wanna know more about what happened to Earth’s twin? This guy I know made a video!
Earth! Beautiful Earth. Our home. Every thing’s home actually. Eighty per cent of earth’s surface is covered by liquid water. There’s so much spare water here that our bodies are mostly made up of it! It’s absolutely everywhere, even locked up deep in the earth’s crust! Enough of earth. We’ve all been there.
Next planet out:
Mars. The cool planet. Every one wants to go here. Pity it’s so cold! Liquid water may exist here in tiny amounts, but most of the red planet’s water is locked up as ice or permafrost just below it’s surface. Plenty there for future colonists to use, but nothing readily available for biological processes. Pity. It’s a beautiful planet. Just ask Matt Damon!
So what is the Goldilocks Zone then?
Here’s the inner solar system. Mercury, Venus, Earth and Mars. Let’s visit a special guest who can explain the Goldilocks Zone for us…
ChefBenbit. (Watch the video when it’s up!)
Nice work Chef! So, if Earth was a bowl of porridge it would be the one Goldilocks ate: the one that was just right! it’s that simple! Earth is lucky enough to be at the perfect distance from the sun, where water likes to slosh around in liquid form. Things would be a lot different here if that wasn’t the case.
So that’s it for now! A simple but important piece of information. The Goldilocks Zone!
How am I going so far?
If you thought I was alright, then subscribe for more. If you thought this video was useful to you, then give it a like! Likes help this channel get noticed. That little notifications bell is just the thing if you want to see more. Go on. You know you want to.
Thanks for watching astrobiological. Giving you the universe in plain human. Ciao!
I have been hard at work rebooting my Bens Lab YouTube channel. This has been prompted by a realisation that a niche topic such as astrobiology is not only insanely interesting, it can keep a niche channel alive, away from the blinding glare of the massively monolithic and sucessful general science channels dominating the platform.
Astrobiology is almost too interesting, and there is plenty of scope for all kinds of interesting viewing. It’ll at least be fun making them. There’s also a huge array of related topics, with some room even for a bit of speculation and fun!
To that end I’ve rebadged the channel a little, and here is the first “proper” video from Ben’s Lab presents: astro-biological:
Were I offered the chance to study again, I know what I would do. Astrobiology. In the last few years it’s been something I’ve followed. The trouble is, I’m easily interested in almost anything I come across. However, I would study astrobiology in a heartbeat. So, what is astrobiology?
Ever since humanity made its first baby steps beyond our thin layer of atmosohere astrobiology has looked to the stars, emerging as a discipline in its own right. It is the study of life on other worlds. Moreover, it is the study of life itself and asks the question: could life exist anywhere else?
We’ve all seen the movies and heard stories. The idea of life on other worlds has had a vice like grip on the human imagination for a very long time. Every single culture on Earth has some accounts of visitors from the sky and encounters with otherworldly beings.
From Judeo-Christian mythology and tradition to the various disparate and yet somewhat homogenous mythologies of Australia’s aboriginal people, it seems we’ve had visitors from the sky for quite some time.
At least so the stories go. Those stories will persist in one form or another for a long time to come, and the popular imagination is still fired up with tales of otherworldly visitors. Just trawl social media sometime and you’ll see what I mean. A search on YouTube: that paragon of level headedness, for a term such as “Area 51” will yield a miasma of conspiracy theories, alien “sightings” and general silly nonsense. Many of these videos have had millions of views. In my first search one particular video had over 20 million views. It was a “sighting” of an alien strolling across a road in some generic American desert setting.
People are eating this stuff up. But what does it have to do with astrobiology? Our desire for interstellar neighbours is always a little, shall we say, elitist? Does all extraterrestrial life need to be flying around in advanced spacecraft and spying on us: the cosmic equivalent of an ant farm?
(Are we that fascinating?)
Astrobiology specifically looks for life beyond earth. That life doesn’t need to be a wookie or a Borg drone. Something as simple as a bacterium would rock the worlds of astrobiologists everywhere.
Missions to other worlds in the solar system have had this in mind for decades now. Missions to Mars almost turned the science world on its head when micro traces believed to be produced by single celled organisms were relayed back to space agencies. Big news indeed. Life on another world. Not Yoda, to be sure, but better! The jury is still out on this “evidence” but time will tell!
You see, astrobiology is the search for life beyond earth. It is the application of a diverse set of scientific disciplines (which includes but isn’t restricted to) chemistry, geology, biology, planetolgy, ecology and astronomy to look for anything. Any life at all. If human or robotic explorers ventured across the gulf of space and found something as simple as a bacterium it would be a massive deal. From the time of earth’s formation circa 4.6 billion years ago life took around a
billion years to appear. The story of life isn’t the key point here. On earth life still took a long time to gain traction. It was only around 800 million years ago that anything as complex as a sponge first appeared, and it went through a pounding before all this happened. The Late Heavy Bombardment, a highly toxic and reducing atmosphere; likely similar to that on Titan today, which was replaced by another highly toxic atmosphere: oxygen. This change led to the greatest mass extinction this planet has ever known. An irradiated, toxic lethal planet somehow gave rise to life.
Astrobiology looks at life on this primeval earth and posits the question: if it could make it here, it kind of stands to reason that it could develop somewhere else. Earth now is a benign paradise, possessing a very particular set of attributes that enable life to thrive. Among these; a thick atmosphere and life giving heat from a nearby sun which respectively enable liquid water to exist at the surface and provide the fundamental energy for life to prosper. Earth possesses an active magnetosphere which shields life from cosmic radiation. These are only some of the factors that make earth just right, like the proverbial bowl of porridge. In fact, in honour of that famous metaphor, Earth is said to orbit the Sun in a “Goldilocks Zone” This means that we are just far enough from the sun that the temperature range is just right for liquid water to exist at its surface. Hence the thing with the porridge.
Many other worlds we’ve examined don’t have any or all of these qualities, but that’s no reason to dismiss them.
Life is seemingly turning up everywhere we look these days, and the more we look the more we see that life is extremely tenacious From the clouds above us to hadean environments deep within the earth’s crust to active nuclear reactors life seems to be able to survive anywhere.
That’s what gives astrobiologists hope.
This post is to be the outline of an upcoming episode on my “Ben’s Lab” YouTube channel. For any who are following the channel (thank you!) It will be undergoing renovations. The subject matter will focus more on things near and dear to my heart, and astrobiology is one of those things! If you like astrobiology please leave suggestions for episode ideas in the comments, or share this with others who like it as well.
References and resources:
This list is not comprehensive and is intended to begin those who are interested on beginning their own research;
Soundtrack: anything that makes you bleed out of your ears..
The horizon is small. It always feels weird when you see it curving away unnaturally the way it does. Of course, this chunk of nowhere you’re on is a little smaller than home on Mars. Even there though tourists from Earth are full of ooh and aahs at the Red Planet’s horizon.
16 Psyche. Take a security job there they said. It’ll be fun they said. Guard the most precious hunk of metal in the solar system; an asteroid over 200 km in diameter, composed almost entirely of iron and nickel. Over a quadrillion dollars worth. This place could smash the earth’s economy to smithereens.
A lot of other places in the solar system have a certain feduciary value. Asteroid mining has been big biz for a long time now. Your grandparents were among the first belt miners, heading out from Hamer Station on Phobos.
16 Psyche is the jewel in the Crown. This chunk of metal comprises nearly one per cent of the asteroid belt. Like all gold rushes there’s naturally a lot of interest, to put it diplomatically. You’re here to take care of folks who get a little….too interested.
This place sure gets boring though. Most security is automated these days. Fleets of weaponised drones orbit the moon, keeping a watchful eye out for unwanted visitors. Space piracy isn’t much like Star Wars. Space is way to dangerous and chaotic for that. No, in this day and age anyone wanting a piece of this prize has to be organised to the fourteenth decimal place. They need to know what they’re doing, and they need lots and lots of money behind them. Like the privateers of old, the only pirates these days are on government or corporate payrolls, mainly out to disrupt things. Occasionally they head out here and make pains in the ass of themselves, but that’s about all they really do. The real wars for territory take place in boardrooms across the solar system.
You don’t care. The view is incredible. You’re walking on the core of a protoplanet!
This place was named Psyche after the greek word for soul. Walking on this bare expanse of metal it seems fitting; that this exposed core is a window into the soul of a dead world…
The gravity on these tiny bodies always messes with you. On Phobos you weigh about 70 grams. Here, you’re the same weight as a small cat. You think back to your time on the tiny Martian moon. Handrails everywhere. The moon was covered with them like chain mail. Too easy to trip over a rock and become an unofficial new moon of the red planet. Who was that guy working out of Stickney Crater? He had a good operation going; a small fleet of drones patrolling the space around Phobos, plucking over enthusiastic hikers from Martian orbit.
You’ve forgotten his name. Who cares anyway? Here on 16 Psyche the handrails aren’t a big deal. The whole asteroid is metal, right? Iron, for the most part. Taking a walk across the metal fissures and canyons is simple. No engineering expertise needed; just magnetic boots.
Break time. You squat down in a dark crack in the surface and log off for a bit.
The commute out here is the ultimate trip to work.
This asteroid lies roughly 3 astronomical units (AU) from the Sun. An AU is roughly 93 million kilometres: the distance at which earth lies from the sun. 16 Psyche spins slowly- so you’ve been told. With only the Milky Way up there you can’t really tell. There’s been a bit of activity today. A few unmarked ships have come a little close. One even buzzed the extraction facility over at Jay Gorge. It’s a low gee quarry basically. The drill broke down, a monster the miners out at Jay call Grindstein. Built on Earth decades ago, Grindstein saw service on Mars and the Moon, carving cities out of the regolith. Now it’s here, taking tiny nibbles out of the most valuable chunk of metal anywhere.
The broken drill is sabotage someone said. Economic rivals want this place, and they’ll stoop to all sorts of tricks to disrupt things anyway they can.
You don’t really care. You really came here because it’s not every day you get to walk on the core of a planet! 16 Psyche is a battle scarred veteran of the very earliest eons of the solar system. Once it was a newly minted protoplanet. Now a remnant, this place dodged other large forming bodies and chunks of debris, orbiting a ten million year old sun. The night sky looked very different then. The solar system was a coalescing mess of rock, ice and organic muck. Everything was colliding and jostling. 16 Psyche’s outer layers were destroyed; torn away by up to eight impacts with other large bodies.
Rough childhood. Maybe this nugget represents what Earth may have ended up looking like, had Jupiter not scooped up rogue planetesimals terrorising the inner solar system during the late Heavy Bombardment.
Where did all that outer shell go? You wonder sometimes. This place took a beating for sure. Now this frozen little nugget is all that’s left. Old NASA sent a mission here way back in the 2020s, sending back pictures of a cracked metal hulk. Not all of the outer mantle was stripped away. About ten per cent of the surface is silicate rock, no different to anywhere on Mars, Earth, Venus or Mercury. That thin veneer was once the mantle and crust of a planet that no longer exists.
Science began taking a back seat to big business sometime after that NASA mission arrived, so the one and only scientific mission to 16 Psyche couldn’t turn up much. But big business was more motivated. All the big players headed out here to slap their dollars, roubles, renminbi or rupees down on the table. There were even people sent here. There’s only so much automation can do. Tunnels were dug into the asteroid, and human beings finally journeyed to the centre of the earth, in a sense. Jules Verne would have been proud. The first tunnel into the core of this core was actually called Verne tunnel….
I hope you’ve enjoyed this little trip into the future. 16 Psyche is just one of a number of bizarre places in the solar system that are worth a tale. There are several other incredible places I plan on visiting in future posts. Tell me what you think!
Follow the nascent 16 Psyche mission, blasting off from a planet near you in 2022.
So. We exist here on our rock, as it flies around our medium size main sequence star, and slowly but surely begin to realise that we are not quite as special as we think. Sure, we’ve come a long way. This isn’t necessarily a good thing. Progress is literally a moving forward. By this rationale the human race has made astonishing progress in the last two hundred years. I won’t rattle off the myriad achievements we’ve ticked off the sentient species bucket list, but we’ve done a lot- let’s just leave it at that. The mobile device or computer you’re reading this post on is one tiny part of that progress.
But one piece of wisdom we have gained in the midst of all this gadgetry is this:
We are not the centre of the Universe.
There. I said it.
Ever since Copernicus, Gallileo et al realised that Earth revolves around the Sun, much human progress and thinking has revolved around the fact that no, we are not the focal point of creation, life has gone on before us (and will carry on long after we’re gone), and that our very planet is turning out to be not quite as unique as we thought.
It seems like every second week a new exoplanet is being discovered and added to a growing bestiary of worlds. Most of those worlds are nothing like earth: but I believe it’s only a matter of time. In our own solar system water; that miracle ingredient for the appearance of life is turning up everywhere we look.
Water is a bit of a superstar. I won’t espouse it’s virtues here, but suffice to say, absolutely no life (as we know it) can exist without it. Water is turning up everywhere it seems. Here are a few examples. I will begin this tour with with the inner planets of the Solar System. For the sake of brevity I will only glance on each location. At this point in time current thinking is focused on certain moons in the outer solar system: “outer” meaning beyond the asteroid belt. Water appears to be abundant as we head outward, but I think it fair that the terrestrial planets get some love too. After all, should humanity ever sort out its myriad problems and eventually stops just dipping it’s toes in the water, one of these worlds might just be a new home for our species. The presence of water would be highly advantageous.
Let’s put together a little list of locales in the Inner solar system where water is thought to exist. I will include Earth here as the first obvious example.
Home to over 7 billion talking monkeys, loads of beetles, bacteria and a whole pile of other beasties all jostling about on the Tree of Life. A middle aged planet, third from it’s parent sun in a non-descript solar system moving quietly through the Orion Arm of the Milky Way Galaxy. There’s a lot of water here, about 1,260.000,000,000,000,000,000 litres. That’s 1260 million trillion litres.
Now, obviously that sounds like a lot, but if you want to really get an idea of how much water this is, just ponder this. Of all water on earth, 96% is saline. Four percent exists as freshwater. Of this four percent, sixty eight percent is locked up in ice and glaciers. Thirty percent of the remaining freshwater is groundwater, and thus not accessible to all and sundry.
About 0.006 of this four percent exists in rivers and lakes.
This tiny sliver of the total global water pie keeps all of us talking monkeys alive.
So, where is this going?
There are vast amounts of water on Earth. But Earth is only one of 8 other planets in the solar system. There are also five dwarf planets, of which Ceres and Pluto are the most famous examples, and 182 moons orbiting various objects and bodies throughout the solar system.
Say again?, you ask. “Ben, are you out of your gourd? Isn’t the Sun that great big hot thing at the centre of the solar system? You know, that really hot thing that is so hot we can feel it’s heat here, from 93 million kilometres away?”
Yes, Dear Reader, the sun is that big hot thing. But researchers have demonstrated the existence of water vapour in the central cooler regions of sunspots. Apparently, so the science goes, these regions are just cool enough that hydrogen and oxygen can get all chummy and form water. Now, liquid water (and obviously ice) are out of the question, but there you go. There is water on the sun. Next.
Poor old Mercury has never had a good trot. The closest planet to the sun, Mercury got baked clean millennia ago. No atmosphere worth mentioning exists, and so you’d think that’d be it. It’s just a barren hellish wasteland. Right?
Like all of the inner planets, Mercury has taken a thrashing from impacts over it’s sad history. It skims around the sun pocked with craters. Some of these happen to sit right on the Mercurian Terminator. A terminator is not a killer robot with poor acting skills. A terminator is simply the demarcation where the planet’s daytime side meets the night time side.
This means that some of these craters contain regions draped permanently in shadow. Similar craters exist on our very own Moon, and yes, water ice has been observed in them! These ice filled craters are being touted as a bit of a sweetener for permanent human habitation on ol’ Luna.
Alas, Mercury doesn’t have much else going for it. It completely lacks a magnetic field, and lost whatever atmosphere it ever had long before Eukaryotes began crawling around.
Say you were an alien visitor to our solar system. Imagine yourself flying in: past the gas giants (what’s with that big red spot?), past all those pesky asteroids (that weird metal asteroid warrants a second look!), even past that blue green marble, with all the chatter pouring out on the electromagnetic spectrum. You keep on flying. It’s been a long flight, but there are two more planets to look at. This next one looks liks a big deal!
As you approach Sol 2 you’re thinking this place seems like Sol 3. Gravity is pretty similar , and it’s about the same size. There are even clouds here: lots of them!
Oh. It’s time to stop using your eyes and switch on some of that fantastic alien technology of yours.
Sol 2 isn’t so nice after all. In fact it’s downright awful. Some sort of disaster has befallen this planet. No magnetic field, atmospheric pressure that will crush your delicate little space gazelle should you ever choose to land and temperatures that can bake cakes.
There is water here though! Thick choking clouds of carbon dioxide and sulfur enshroud the planet, but there are traces of water in the atmosphere! It’s only 0.002 percent to be sure, but it’s there.
Your space gazelle (translation: extremely sleek and advanced spaceship) has beauty AND brains. Scans show hydrogen and oxygen ions trailing out behind the planet, and you realise that water loss is an ongoing issue for Sol 2. Solar winds have been slowly stripping Sol 2 of water for a long time; maybe billions of years, leaving this hellish dessicated planet behind. It’s a pity, you figure. Sol 2 would have been nice once. Sol 3 beckons as a potential home sometime, but the natives are barking mad. Looks like rolling in and blowing stuff up might be the only way after all. All that water!
Sol 3 has been studied to death, so you decide to swing around and take a look at the Red Planet.
Dry as a bone. Peaceful to be sure, but this planet is dead. Weighing in at roughly one third the size of Earth, Sol 4 may have struggled to hold onto any atmosphere it may have had.
Of course, being a little guy isn’t the be all and end all. Titan is the largest moon of Saturn. Somewhat smaller than Mars, yet fifty percent larger than our own moon, Titan sports an impressively thick atmosphere: thicker in fact than our own. Unfortunately Titan can be shunned from this article: it posesses oceans…..of liquid methane. No water here folks. I include Titan to demonstrate that smaller worlds can possess respectable atmospheres.
Mars, like Venus, is missing a key component here. Earth is the proverbial bowl of perfect porridge; just right. Many features of Earth are conducive to life, but perhaps one of the most important is the presence of an active core. This one feature prevents harmful cosmic rays from degrading DNA so badly that life mutates itself to death. It also prevents said rays from stripping away our water and atmosphere. This appears to have happened on Mars and it’s happening on Venus as we speak.
Does it, doesn’t it?
Mars is turning out to be a slippery customer. Evidence for erstwhile liquid water on the red planet seems to be piling up. It’s heading toward consensus that Mars once was much warmer and wetter than it is today.
NASA’s Curiosity rover is the closest we’ll get to visiting Mars for some time yet, and it has captured some pure Martian magic on it’s sojourns across the dead and lifeless face of possibly humanity’s first true stepping stone to the stars.
Possibly the greatest aspect of Curiosity is that it is a quintessentially human mission. Human eyes see the surface of Mars, beamed across vast distances and tease out information about this place. One simple photo can convey a lot if you know where to look and what to look for:
Essentially the general thrust of new discoveries these days is that it’s more likely for water to be somewhere than unlikely. I will end this blog post with new insights into water back here on Earth. As mentioned previously, several moons in the outer solar system are posited to possess vast quantities of water in the form of sub surface briny oceans.
However, it turns out Earth has a few surprises still up it’s sleeve. A diamond ejected around 90 million years ago from a volcano in Juina, Brazil contains imperfections, that, like a seemingly trivial clue in some glossy crime investigation show, point the way to to the one time existence of a subsurface ocean deep in earth’s crust. In fact, this ocean was (is?) posited to have descended nearly a third of the way to the edge of Earth’s core. These clues come in the form of hydroxyl ions, which normally only come from water. More evidence is arising, pointing toward water’s earlier appearance on Earth than expected. I will write about this and similar topics as I am able.
More posts on water in the solar system will be up as soon as I find time to write more. Keep on looking up! The Universe is there. See you next time, and thanks for reading.