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: something from Blade runner. If not that, then “Worlds in Collision” by God is an Astronaut
Someone will die in space. Some day someone will be killed whilst working on an offworld colony or space station.
Perhaps more to the point; space will not be devoid of crime. As humanity begins it’s gradual ascent beyond low earth orbit everything that makes us human will follow us out into space: our drive to explore, to look upon new vistas, and our darker side. It makes sense really. The corporate world will be at the forefront of the conquest of space. Big money will be planting it’s flag whether it can. Wherever money goes, corruption soon follows. One day someone will unwittingly join a select group of other human beings who have achieved a first in space. They will be the first murder victim.
Law enforcement will extend its reach to the other worlds of the Solar System. I don’t think to speculate on the finer details and brushstrokes of law and order beyond Earth. I do think it would be an interesting thought experiment to wonder just what may await the very first space cop to come across the very first murder scene in space….
Ceres comes around, drifting into view as your transport approaches. The mining facility on the dwarf planet and the transports AI exchange pleasantries; handshakes, exchanges of code and other silicon bureaucratica dart across several thousand kilometres of vacuum. The transport is on old Tesla: a pilotless model now used as a taxi between outposts in the asteroid belt. Ceres is of course the largest settlement out here. Ever since the Asteroid mining business took off in a big way in the 2050s, this stretch of space between Mars and Jupiter is the new Wild West. 16 Psyche; the remnant metallic core of an ancient protoplanet is the real prize. Ceres is the main stop off point to 16 Psyche and scores of other frontiers out here. Now it’s the first crime scene in the Asteroid belt.
You’re quietly amazed it’s taken this long. 16 Psyche has seen plenty of action. It’s heavily guarded. It has to be. It’s worth over 10000 quadrillion dollars. Plenty of skirmishes. Ceres is quieter, but people will be people. Get a few hundred thousand together in an enclosed space and they begin acting funny.
Not funny haha either.
See, cops on Earth have it real easy. People have been killing each other there since before they were people. There’s a lot of knowledge to draw upon, because forensics and taphonomy have several thousand years of crime to study. All of it earthbased. Up until this day outer space has technically been a Utopia. No killing. You feel like you’re investigating a murder in the Garden of Eden.
Boy, that would be a story and a half….
So what does happen to a body in space? What happens to a body on another planet? Every single environment we can think of beyond Earth is utterly hostile to anything larger than a bacterium, and even they have only managed to hitch rides on spacecraft. Life isn’t at home in space. So how would death work there?
That sounds like a dumb question. Death doesn’t work. When you die you stop working, right? Huh!
Death is messy, but it’s actually a process, with discrete steps. Of course all living things cease functioning eventually, but for all multicellular organisms death is akin to synchronised swimming: hard to figure out with a lot happening beneath the surface.
Death comes to us all, from the smallest bacterium to the largest redwood tree. It had one obvious and final result, but this result can be arrived at in many ways. It all depends on exactly what you are too.
When you die, yes, you stop working, but like a cheesy zombie movie it doesn’t really end there. There’s still plenty happening as your body transitions back to inanimate matter. Because that’s what’s happening really. You’re being broken down and cycled back into the firmament.
Okay. So you’re dead. (Just work with me okay?) Your heart has stopped and your body is switching off quickly. About 4 minutes after death your body begins to undergo autolysis. This essentially means that your body is digesting itself. This is as disgusting as it sounds. As oxygen decreases to be replaced by carbon dioxide cellular enzymes in the body are free to roam unchecked. So off they go, breaking down all in their path; rupturing cell membranes and releasing their contents into the mix. It’s like the prison guards have suddenly stopped being paid and so they decide to let all the prisoners loose. Obviously a riot would ensue. Autolysis is your body being broken down by a biochemical prison riot.
Gases are produced inside your body by all of these enzymes and microorganisms: particularly in your gut. Your body swells like an unopened can of coke after being shaken.
This is where the magic happens. Microorganisms are now officially in charge. Further breakdown of tissue turns you into a fetid mess. Those gases produced during the bloat stage? Those ones in your now distended gut? They begin escaping; sometimes violently. We all know what happens when gas escapes our bodies. Sometimes this out gassing is so nasty it ruptures the skin! Putrefaction essentially means that decay is running rampant and you now resemble an extra from “The Walking Dead”. If you’ve ever seen that show, or anything featuring the undead, you’ll notice that often the dead are crawling with maggots. This is an important stage in decomposition. Breakdown by insects and larger animals is part of putrefaction, and a necessary function performed by these creatures. If nothing broke down dead bodies the world would be awash with diseased corpses. Forget “The Walking Dead”. This is nowhere near as cool as it sounds.
The last discrete stages of decomposition are mummification and skeletonisation. Mummification means that whatever is left behind after voracious bacteria have exhausted your body’s nutritional goodness and larger creatures have cleaned you out and moved on just dries out. Usually this is skin. It becomes a dry dessicated shrink wrap around your bones, which are themselves leaching their component compounds into the environment.
So that’s it in a nutshell. Death.
Hang on, you say. I thought this post was about Ceres! I thought it was gonna be detective story set in space, like CSI meets The Expanse! Well it is, but to understand how death works and to understand death in space we only have a single frame of reference: Earth.
Let’s head back to our unfortunate murder victim, sailing serenely around the largest asteroid/dwarf planet in the solar system. You’ve gone out and collected the body, cursing several poor life choices as you bring it into your transport.
Be a space detective in a someone’s blog post they said. It’ll be fun they said.
The body on the slab can’t tell you much. Trying to work out a time of death will be problematic, at best. It’s hard to tell how long this guy’s been floating home. See, the stages of death mentioned before tend to be fairly discrete and take place in a fairly predictable sequence. Of course Earth is one big mess of wildly changing environments and variables. Gil Grissom would have found life easier out here. Space is a little more unchanging.
When someone steps beyond the veil you can almost set your watch (metaphorically speaking) to these physical stages:
Pallor mortis. A paleness sets in within minutes; more noticeably in those with lighter skin.
Algor mortis. Internal temperature regulation is switched off. The body’s temperature acclimatises to that of the external environment. The rate of acclimation can actually be used with some precision by investigators to determine a reasonable time frame.
Rigor mortis. A stiffening of the body occurs around 4 hours after death. This is due to chemical changes in the body causing cellular fluids to gel. This can be affected by the environment. For example, freezing cold can greatly prolong the time it takes rigor mortis to take hold.
Livor mortis. When a body has been prone for some time blood (particularly the heavier components like red blood cells) settle, pooling in the dependent or lower portions of the body. This causes reddish purple discolouration in these lower portions. Livor mortis usually starts becoming really apparent about 2 hours after death.
Alright then. You’ve read the Wikipedia pages. You know how death works.
But you’re in the asteroid belt. There’s no gravity, no air and no insects or scavengers out here to make short work of this poor sap’s remains..
Time to roll your sleeves up.
A lot of things are confounding your attempts to determine a time of death. First of all being in a vacuum has freeze dried him. He went out for a nice space walk without his helmet, remember? His nostrils and mouth look burnt because they are. In a vacuum liquids instantly boil away. It’s no different to what happens when you open a can of coke. The pressurised carbon dioxide in the drink depressurises, forming bubbles of gas. This is a more extreme example. The saliva and fluids in his nose boiled away instantly. Ouch.
People don’t explode in space. Forget every B-grade science fiction movie you ever saw. Your skin is actually pretty tough- as are your eyeballs. This guy is bloated though. Depressurisation has caused the water in his body, particularly in his circulatory system, to start boiling. His blood vessels have expanded and ruptured. Not to mention the fact that this guy didn’t listen to any safety instructions during his time in space. Golden Rule when being cast out onto the Big Empty: exhale. Do not hold your breath. Have you ever blown too much air into a balloon? The air inside becomes pressurised, more so than the air around the balloon. We’ve all scared enough small kids and cats to know what happens. You’re trying not to imagine what’s left of this guy’s lungs.
So anyway. There goes bloat as a yardstick.
So. Your murder victim is frozen, freeze dried and a purple mess with a case of weapons grade sun burn. No sunblock out here. No pretty blue sky protecting him from deadly solar radiation. Had he survived he would have had a million percent chance of terminal cancer anyway, and soon. Livor mortis is nowhere to be seen. No gravity well down which red blood cells can settle. Algor mortis seems tricky too. He didn’t freeze instantly. Again, forget those bad Sci Fi movies. Heat transfer happens via conductance. Space is a vacuum. There’s nothing to draw heat away from this man’s body. He’s frozen now, but he’s not a popsicle. About the only normal stage of death you notice is rigor mortis. The ion channels and transfers involved in muscle contraction and relaxation don’t seem to be affected by being in a vacuum.
Maggots and scavengers feeding on a body are disgusting to be sure, but they’re also really handy for determining how long a body has been lying around somewhere. Insects are purely driven by instinct, so on finding fresh meat they deposit eggs, or feed or interact with the corpse in very discrete waves or phases. These phases and even their durations are so predictable that forensic entemology is one of the most useful tools investigators have when determining times of death.
Stupid earthbound forensics guys you mutter under your breath. They think they’re so cool, don’t they? Not so much as a tick on this guy. Not even bacteria or fungi. They don’t do well in a vacuum and they’re all in cold storage. Radiation would have wiped most of them out too. This guy is basically perfectly preserved. No pooling of blood, no putrefaction and no chew marks from hungry scavengers!
It looks like you might have to look beyond regular physical and chemical factors surrounding death here, because out in space they mostly don’t apply.
Cause of death? Er, being thrown into space without a helmet! He would have passed out within a minute or so. Blood pressure became essentially nil, resulting in no oxygen getting to his brain at all. In addition exposure to the vacuum caused oxygen to be dumped from his brain. He died of asphyxiation, before ruptured lungs and internal membranes got to him.
Your first instinct as a cop, and particularly as a space cop in this blog post is to establish a time of death. Unfortunately, no such studies have been carried out just yet. Mankind is still stuck in Low Earth Orbit. If the forces of ignorance ever gain control (if they haven’t already) we may never leave LEO.
But, if we do…it’ll be business as usual. Crime will colonise the solar system along with us and wouldn’t it be useful to get some space forensics knowledge under our belts, so we’re ready and waiting for it?
What do you think?
Vass, Arpad A (November 2001). “Beyond the grave – understanding human decomposition” (PDF). Microbiology Today. Spencers Wood: Society for General Microbiology. 28: 190–192.