Planet Building: Possible?

astroarchaeology, astronomy, scicomm, science fiction, Science fun, solar system, Uncategorized

If you don’t want to read, then listen! I have put this post up on a podcast I’m doing, available on Anchor FM, as well as certain other outlets.

https://anchor.fm/astro-biological/embed/episodes/Planet-Building-e1ff39

If anyone has read “The Hitchhiker’s Guide to the Galaxy” quadrilogy they would have been struck by some of the big ideas hidden within Douglas Adams’ deadpan humour. One of the heavy concepts that stuck with me was the idea of planet building. According to the story, Earth as we know it today is a planet sized super computer, built to perform one task: to figure out the meaning of life. A planetary architect named Slartibartfast is entrusted with overseeing the rebuild of Earth after it’s destroyed due to a galactic scale clerical error.

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Planet building.

Possible? Why not? According to prevailing theories, planets mainly form via the process of accretion. Simply put, particulate matter adrift in molecular clouds clumps under the inexorable pull of gravity, forming ever larger clumps that clump to ever larger clumps and so on. Eventually a planet or star is the inevitable result.

A newly formed exoplanet (in the dotted circle) orbits a newly formed, newly discovered star: CS Cha. Image: Space.com

Why couldn’t this be done artificially? Would it be even possible? If it’s just a matter of throwing lumps of crud at other lumps of crud and hoping they stick, then why couldn’t it be?

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Scenario:

It’s the future. Humanity lives and works in space. The asteroid belt is the new frontier or wild west. Chunks of formerly useless rock are now homesteads or villages. Distances are not overly tyrannical. An asteroid is typically only a few light seconds from another. However, asteroids can be moved. Bigger asteroids like Ceres, Vesta or Eros would comprise the main hubs of commerce and trade in this new world.

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A new frontier… Image: Maciej Rebisz

Smaller settlements such as these “homesteads” could make life easier for themselves in terms of travel times (and therefore fuel costs) to larger, more important settlements by moving closer. In the frictionless, zero gravity environment that is space this wouldn’t be too technically difficult.

Scenario:

Time has moved on. The asteroid belt is a thriving collective of trade networks and conglomerates of smaller settlements. Smaller asteroids now cluster around larger ones like space junk in low earth orbit. Economically, this proximity is making things easier for everyone, and lots of people are getting rich.

Just imagine though if humans disappeared. The zombie apocalypse hit outer space and spread to all corners of the solar system.

(That’s the fun explanation)

Every living human is gone, and the asteroid belt is now a vast ghost band, forming a wreath around the sun, somewhere between Mars and Jupiter. There are all these swarms of asteroids now adrift, all artificially brought closer together by generations of enterprising human beings No course corrections keep them from colliding and so many of them are doing just that. Orbits decay, and tiny chondrite specks plough slowly into larger planetesimals.

See where I’m going with this? Over time, natural accretion would naturally lead to planets forming, or at least a large moon sized object. In millions of years the solar system could have a tenth planet (let’s just sneak Pluto back into the club. Don’t tell anyone!)

Planet Building! Essentially a garbage planet could form from the artificially placed asteroids and other objects now in very close proximity and drawn by the slow but inescapable pull of gravity.

I think it’s an exciting idea: a real megastructure! The ultimate megastructure!

What next?

This post was inspired by a chance statement in a video discussing space colonies on Isaac Arthur’s Science and Futurism youtube channel. Check it out. Isaac has a huge catalogue of lengthy discussions on some really interesting concepts. Here is a link to the relevant video if you’re interested:

Last but not least, here are links to the social media for Maciej Rebisz, the talented artist behind some fantastic space artwork, including the asteroid colony about halfway down the post.

facebook – https://www.facebook.com/maciej.rebisz

twitter – https://twitter.com/voyager212 – general updates

artstation – https://www.artstation.com/mac – art

society6 – https://society6.com/macrebisz – prints

Join me on my facebook group:

https://www.facebook.com/groups/AstroB/

And on YouTube. I’m not quite up to the standard of the venerable Mr Arthur (yet), but I’m working on it. Help me on this journey and subscribe!

http://www.youtube.com/c/BensLab

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An Accidental Ecosystem in Space

astroarchaeology, astroarcheology, astrobiology, Biology, ecology, scicomm, science fiction, Uncategorized

Update:

I’m always interested in podcasting, and I’ve created an episode of a tentative series on the Anchor app. It’s just this blog post read out. Convenient for those whom listening is a better way to digest content. Here’s the link:

Listen to my segment “Abandonment among the stars” on Anchor: https://anchor.fm/astro-biological/episodes/Ecosystems-in-an-Abandoned-Megastructure-e1e59n/Abandonment-among-the-stars-a3bp5i

Imagine this. It’s the distant future. Space travellers have discovered a huge structure in deep space. Let’s assume the travellers aren’t human. These beings have stumbled upon the greatest discovery in their history. A vast megastructure, hundreds of kilometres long, it’s a huge cylinder spinning slowly across interstellar space. The structure is a riotous collection of cyclinders, and other smaller structures seemingly thrown together. Tests on the structure reveal it’s very old: several thousand years at least. No signals or signs of current occupation can be found, and it’s determined after several years of examination and debate that the structure is abandoned.

An O’Neill cylinder, adrift in cyberspace.. A 3D model of a physical model I plan to build.

The very first team is sent on board…

What do they find?

The structure is derelict, to say the least. The team can safely determine this. There are no signs of intelligent life.

Mechanisms keeping the cylinder habitable are still somewhat operational. By some miracle of engineering the cylinder still has gravity as well.

But that’s not to say that life hasn’t found a way.
The structure is exploding with life!
The structure is essentially intact. It continues to rotate, driven by some unknown energy source and mechanism. It orbits a medium sized yellow star, lying just beyond the orbital path of the second planet out from this sun. The second planet is completely uninhabitable.

Image: Pixabay

There is a third planet from the Sun which seems habitable. Other expeditions are already exploring that world, and it seems this cylinder was built by whatever sentient beings once lived there.

Image source: Unknown

The structure is an oasis of life, all alone in the night. The builders may have long vanished, but the other organisms they brought on board: whether they be pets, food or pests, don’t seem to know they shouldn’t be here claiming this place as their own. It’s become an accidental ecosystem that has no business being out here and yet out here it is.

….

A couple of weeks I decided to do something different with all the video stuff I do. I did a livestream on facebook and periscope. The topic of my stream was the very question addressed above: what new ecosystems and organisms could arise in an abandoned, livable space station were the human occupants to disappear?

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Image: Pixabay

It actually really got me thinking. The whole thing began as a random question on Isaac Arthur’s Science and Futurism facebook group. To my surprise there were a lot of great comments and ideas in response to this question.

I’ve addressed this subject matter before. A blog post explored the nature of interactions between the natural world and those sad, abandoned places on the periphery of civilisation. It’s like discovering a completely new world when I stumble upon these “transitional” places. Imagine finding such a world like the cylinder orbiting Venus. Just how and in what direction would any life on board manage?

It’s a really interesting question, and ties into the nature of life and how it has spread across our own planet. Most life existing today hasn’t arisen spontaneously from the firmament. Nothing’s done that for around 4 billion years. No, life has migrated, hitched rides or been tossed about by catastrophe and happenstance. It has essentially gone where the wind blows, and taken root wherever it has landed. The theory of panspermia relies on this vagrancy to offer an explanation for how life might have appeared here in the first place. I personally think Panspermia is very plausible.

In some ways we’ve seen panspermia in action, from a certain point of view.

This is of course, a very tenuous observation I make, but the principle is the same, using the example of Ascension Island in the Atlantic Ocean. This tiny little mound of dirt popping up from the waves is a giant ecological lab, an ongoing experiment that began over 150 years ago. All manner of species: some introduced, some native, were thrown together, on a barren little rock. Within decades, the island was a lush green paradise, with new ecosystems and new equilibriums. Quite amazing really, and Ascension Island represents a window into the greening of a dead planet such as Mars.

So. To return to the premise of this post. Explorers find a derelict space colony, now overrun by non human life. We’ve seen this on Earth too. Life is especially good at exploiting new niches. When the dinosaurs perished, the mammals that had lived in their shadow for 180 million years suddenly had an entire planet all to themselves. This resulted in the Tertiary radiation, a speciation event rivalling the Cambrian Explosion in the profusion of new species of mammal that suddenly appeared to exploit all this open space. Disaster ecology is an area of study devoted to this knack life has of adapting to catastrophe and finding new balances. Places like Ascension Island are one example of this. Others, like Chernobyl, are another.

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Life is doing nicely in the radiation soaked wilderness of Chernobyl. Image: James Beasley and Sarah Webster, National Geographic Creative

So what of my superstructure, adrift in orbit around Venus? It would take several posts to really give it some justice, and so that’s what I’m going to do. A few posts on the post human world in a self contained semi functional space colony.

I must admit I have not been active with this blog lately. I have been busier than usual with new work and things in personal life shifting and changing constantly. It’s never forgotten. This will be attended to, and posts are going to start going up on a more frequent basis. Stay tuned, keep reading and I’ll be writing soon.

Ben.