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420chan is Getting Overhauled - Changelog/Bug Report/Request Thread (Updated April 10)
the sun has fallen down Ignore Report Reply
Kiyotsugu Hirayama - Tue, 16 Jun 2015 22:13:13 EST ID:fhuRENSe No.55412
File: 1434507193485.png -(22297B / 21.77KB, 411x411) Thumbnail displayed, click image for full size. 22297
what would happen to the earth and the rest of the pack in the system if suddenly the sun dissapeared? how quickly would the planet freeze?
Arthur Eddington - Wed, 17 Jun 2015 02:52:00 EST ID:lHGvTKQL No.55413 Ignore Report Reply
>how quickly would the planet freeze?
I can answer half of this question, the other half requires advanced knowledge in thermodynamics.

Your partial answer is that it takes 8 minutes for the sun's energy to reach Earth so the freezing process would start 8 minutes after it disappears.

I have no idea how long the atmosphere could retain enough heat to keep the average temperature above the freezing point of water and I cannot be fucked to try to answer that part.
Jan Hendrik Oort - Wed, 17 Jun 2015 05:19:06 EST ID:YHjXylC8 No.55414 Ignore Report Reply
1434532746011.jpg -(66000B / 64.45KB, 1280x960) Thumbnail displayed, click image for full size.
The positives: https://what-if.xkcd.com/49/
The negatives: http://www.popsci.com/node/204957
The surface would be arctic within a week. The deep oceans and underground would be kept warm by thorium fission for a very long time.
Cecelia Payne-Gaposchkin - Wed, 17 Jun 2015 10:52:27 EST ID:415JX8nG No.55415 Ignore Report Reply
I bet in a day the all the land masses would be frozen. In a week the atmosphere would be freezing onto the planet. And in a month the oceans would be frozen down to a few km.

I read that even if the sun disappeared, life could survive around the bottom of the ocean around hydrothermal vents for a few million years, maybe a few hundred million. I feel like closing those systems off would cause a build up of toxins, but they might be more self sustainable than I think.
Nicolaus Copernicus - Wed, 17 Jun 2015 16:47:34 EST ID:k2JuY3q4 No.55416 Ignore Report Reply
wow, thanks a lot for the answers. it's more than I need.
now, what would be your measure of choice in order to keep the planet warm? the popsci article talks about geothermal energy and relocating near active volcanoes.
of course the rest of the ecosystem would collapse, but humans will surely try to stretch their chances.
Jan Hendrik Oort - Wed, 17 Jun 2015 17:21:19 EST ID:YHjXylC8 No.55417 Ignore Report Reply
1434576079011.jpg -(23321B / 22.77KB, 500x331) Thumbnail displayed, click image for full size.
This is a volcanic vent in Antarctica. The area around it is not habitable. The planet will become colder than that.

Geothermal and nuclear plants are the only methods of any scale that could be run for years if there was a catastrophe.
If there were enough proximity, farms could be set up in underground salt mines to last a few years.
Ultimately, nuclear and geothermal are the only power sources that aren't derived from our sun.
Harlow Shapley - Sat, 20 Jun 2015 05:45:05 EST ID:X6E5uhNi No.55429 Ignore Report Reply
Urbain Le Verrier - Mon, 22 Jun 2015 18:01:16 EST ID:4qq7TOTM No.55437 Ignore Report Reply
thanks to this video I found this short speculative fiction gem:
Thomas Gold - Wed, 15 Jul 2015 23:13:49 EST ID:415JX8nG No.55517 Ignore Report Reply
If my imagination is allowed to run wild, I would put the earth in orbit around Jupiter, close enough to cause a decent amount of geologic activity and keep some sort of an atmosphere, even if it's toxic and much less dense than ours is today.

The center piece of civilization would probably be fusion/fission nuclear reactors, we could mine hydrogen from Jupiter. But we would need manufacturing hubs, mines, and genetically modified plants in vertical farms. I think it might be best to put residential areas around hydrothermal vents. But the other stuff will probably need to be above ground
Johan Galle - Sun, 19 Jul 2015 19:34:02 EST ID:BF8zYeiD No.55530 Ignore Report Reply
I love that story. So cool.

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