Last week, NASA called a press conference for the Perseverance rover team to make an exciting announcement; the " clearest sign of life that we've ever found on Mars". Further analysis continues on the potential biosignatures , attempting to rule out non-biological explanations, but while we wait there is plenty of time for speculation on what such a discovery might mean. The rest of this article is behind a paywall. Please sign in or subscribe to access the full content.

As well as telling us about alien life and how it evolves on other planets, discovering alien life on Mars could provide helpful clues to what is going on in the wider universe. One mystery on which it may provide further clarity is the Fermi paradox, or the age-old question "where is everybody?", and even whether hu

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