NASA has revealed the clearest signs of life on Mars ever after making an incredible rover discovery.

Evidence of ancient alien microbes have been uncovered in a dry river channel formed roughly 3.7 billion years ago, scientists reported Wednesday.

A sample obtained by Nasa's Perseverance rover found sediment on the bottom of the ancient Neretva Vallis lake which points towards potential signs of ancient microbial life , according to scientists.

Researchers say the rocks contain tiny dark specks which are less than a millimetre in length and have been nicknamed "poppy seeds".

Other sediments found contain larger dark-rimmed rosettes with lighter centres - dubbed "leopard spots".

Both speckles are said to be rich in iron and phosphorus.

These chemicals can form when ti

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