# Sterile version of earth dscovered **URL:** \ **Category:** In My Humble Opinion\ **Created:** [January 19, 2015, 2:37pm UTC](https://boards.straightdope.com/t/sterile-version-of-earth-dscovered/710282 "2015-01-19T14:37:04Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![HoneyBadgerDC](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/honeybadgerdc/32/1033_2.png) [@HoneyBadgerDC](https://boards.straightdope.com/u/HoneyBadgerDC)\ **Post date:** [January 19, 2015, 2:37pm UTC](https://boards.straightdope.com/t/sterile-version-of-earth-dscovered/710282/1 "2015-01-19T14:37:04Z")
I f we were to discover a planet that was basicaly a sterile version of earth with no organic traces of past life what would be the process to infect it with life and how long before it might become habitable or self sustaining? ---
**Author:** ![Bosda\_Di\_Chi\_of\_Tricor](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/bosda_di_chi_of_tricor/32/16845_2.png) [@Bosda\_Di\_Chi\_of\_Tricor](https://boards.straightdope.com/u/Bosda_Di_Chi_of_Tricor)\ **Post date:** [January 19, 2015, 3:38pm UTC](https://boards.straightdope.com/t/sterile-version-of-earth-dscovered/710282/2 "2015-01-19T15:38:41Z")
Just poop in a mud puddle, _and they’re off & running!_ Life (not just Dinosaurs) finds a way. ---
**Author:** ![Chronos](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/chronos/32/134_2.png) [@Chronos](https://boards.straightdope.com/u/Chronos)\ **Post date:** [January 19, 2015, 3:41pm UTC](https://boards.straightdope.com/t/sterile-version-of-earth-dscovered/710282/3 "2015-01-19T15:41:59Z")
You wouldn’t even need to poop. Everything from our planet is contaminated with life, whether we like it or not. Probes that have sat on the surface of the Moon for decades still have viable bacteria on them. ---
**Author:** ![LSLGuy](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/lslguy/32/5813_2.png) [@LSLGuy](https://boards.straightdope.com/u/LSLGuy)\ **Post date:** [January 19, 2015, 4:02pm UTC](https://boards.straightdope.com/t/sterile-version-of-earth-dscovered/710282/4 "2015-01-19T16:02:58Z")
The OP isn’t clear on exactly how similar his Earth-prime (E’) is to ours. And many geophysical facts about Earth are strongly driven by our current and historical bioshere. I’d suggest that a sterile E’ will have approximately zero free oxygen. It will all be bound up in crustal rocks. So Job One would be to get some life-based processes going to free up the oxygen. So first we need to infest the place with photosynthetic cyanobacteria. Then wait a few dozen million years for oxygen to become abundant enough to start introducing more typical Earth species of aerobic bacteria. Which in turn after a few million years provide the substrate for plants and, even later, animals. See [Great Oxidation Event - Wikipedia](http://en.wikipedia.org/wiki/Great_Oxygenation_Event) for more. ---
**Author:** ![CarnalK](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/carnalk/32/486_2.png) [@CarnalK](https://boards.straightdope.com/u/CarnalK)\ **Post date:** [January 19, 2015, 5:07pm UTC](https://boards.straightdope.com/t/sterile-version-of-earth-dscovered/710282/5 "2015-01-19T17:07:19Z")
Hmm that seems pretty complicated, LSLGuy. Isn’t there some way to do it with a modified photon torpedo? Think I read about that somewhere. ---
**Author:** ![Tuxie](https://avatars.discourse-cdn.com/v4/letter/t/ee59a6/32.png) [@Tuxie](https://boards.straightdope.com/u/Tuxie)\ **Post date:** [January 19, 2015, 5:11pm UTC](https://boards.straightdope.com/t/sterile-version-of-earth-dscovered/710282/6 "2015-01-19T17:11:27Z")
Well in Total Recall all it took was some giant alien toaster vaporizing a bunch of subterranean ice to get Mars a breathable atmosphere and pressure. I’m sure we could work out something similar? ---
**Author:** ![Quartz](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/quartz/32/267_2.png) [@Quartz](https://boards.straightdope.com/u/Quartz)\ **Post date:** [January 19, 2015, 5:32pm UTC](https://boards.straightdope.com/t/sterile-version-of-earth-dscovered/710282/7 "2015-01-19T17:32:27Z")
We did a variation of this [quite recently](http://boards.straightdope.com/sdmb/showthread.php?t=638692).