The Allan Hills Meteorite is a Martian meteorite that contains evidence of fossilized microbial life. It was retrieved in 1996.
When scientists announced in 1996 that they discovered evidence of fossilized microbial life in a meteorite from Mars, it was a pivotal event. President Bill Clinton made a national address about the discovery, which seemed to herald the news that we are not alone.
Subsequent analysis of the research, on a meteorite called Allan Hills 84001 (ALH 84001), produced controversy, with many experts asserting that the fossils could have been created by non-living processes.
The evidence is still debated, and the space rock remains a topic of ongoing research.