A crew aboard the International Space Station performs a successful capture of a space probe returning from Mars with a sample inside. The crew is tasked with studying the sample, which may be the first proof of extraterrestrial life. However, the study eventually backfires as the organism displays incredible strength and gains intelligence, becoming extremely hostile and killing them all one by one. Trapped aboard the ISS with the rapidly-growing organism, the crew must find out how to kill it before it manages to escape and destroy Earth.
Life on Mars has been long speculated. Liquid water is widely thought to have existed on Mars in the past, and now can occasionally be found as low-volume liquid brines in shallow Martian soil. The origin of the potential biosignature of methane observed in Mars' atmosphere is unexplained, although hypotheses not involving life have also been proposed.
There is evidence that Mars had a warmer and wetter past: dried-up river beds, polar ice caps, volcanos, and minerals that form in the presence of water have all been found. Nevertheless, present conditions on Mars' subsurface may support life. Evidence obtained by the Curiosity rover studying Aeolis Palus, Gale Crater in 2013 strongly suggest an ancient freshwater lake that could have been a hospitable environment for microbial life.
Current studies on Mars by the Curiosity and Opportunity rovers are now searching for evidence of ancient life, including a biosphere based on autotrophic, chemotrophic and/or chemolithoautotrophic microorganisms, as well as ancient water, including fluvio-lacustrine environments (plains related to ancient rivers or lakes) that may have been habitable. The search for evidence of habitability, taphonomy and organic carbon on Mars is now a primary NASA objective.
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