There are definitely no signs of life in our solar system, although there is probably life out there some where in the universe. All life on Earth requires carbon, hydrogen, oxygen, nitrogen, sulfur and phosphorus as well as numerous other elements in smaller amounts, and most scientists agree that these basic materials are in order to sustain live on other planets.
There is some limited evidence that microbial life might possibly exist (or have existed) on Mars. An experiment on the Viking Mars lander reported gas emissions from heated Martian soil that some argue are consistent with the presence of microbes. However, the lack of corroborating evidence from other experiments on the Viking indicates that a non-biological reaction is a more likely hypothesis. Independently, in 1996, structures resembling nanobacteria were reportedly discovered in a meteorite, ALH84001, thought to be formed of rock ejected from Mars. This report is also controversial, and scientific debate continues.
A softball size meteorite labled ALH84001 discovered in 1984 in Antartica which was thought to have originated in Mars had evidence of Polycyclic aromatic hydrocarbons. When microorganisms die they breakdown into PAHs and these were discovered in this meteorite.
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