Is there life on Mars?

David Bowie sang a good song about it back in the Seventies, but NASA scientists are reporting that the presence of methane on Mars could actually signal life.

Methane can only live for a short time in the Martian atmosphere which means the gas must be constantly replenished – and that only leaves two options:

1. active volcanoes (none of which have been found yet on Mars)

2. microbes


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