The intensifying hunt for life on Mars has found minerals in a rocky crater that suggest biological activity may have taken place there.
Nasa’s Perseverance rover dug out mudstones flecked with iron-containing compounds notable because similar structures on Earth are thought to be chemical evidence of living organisms.
Researchers now want to bring the samples back from the red planet to establish whether they do indeed show life there, a riddle that has gripped experts and popular culture for generations.
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