The existence of aliens has long been a subject for conspiracy theorists to get their teeth into but last year Nasa scientists revealed they had found water – the key ingredient to life – on Mars.

Photos of a Mars possessing a blue sky like Earth emerged this week, further igniting the argument if the Red Planet was once a sister planet to ours.

Last year space boffins believed a giant alien “megastructure” could be orbiting around the Milky Way.

It was initially dismissed as comets whizzing past – but experts now say test data proves it couldn’t be comets.

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