There's a high chance aliens are out there, so why haven’t we met them yet?
We’ve been listening for communications from deep space, and we’ve pinged out radio signals into the ether to try and contact other civilisations, but no one has called back
Mission to Mars: the enduring appeal of the Red Planet
Nasa’s latest call for astronaut class saw a record-breaking 18,300 applications, which might be down to the agency’s designs on Mars
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