Humans have been trying to contact aliens for many years, but do the aliens want to contact us? – Sai, aged eight, London, UK This is a great question – and the truth is that we don’t know the answer.

Alien life could take many different forms, but one possibility is captivating scientists: alien "plants". What would they look like? And how could we find them? On the Orion arm of the Milky Way ...

Ethel the space alien lived on the planet Casa, a long way away from Earth. She loved travelling and making new friends. One day Ethel started a new job as a 'Faraway Friend Finder'. Her mission was ...

It was 40 years ago that two Japanese astronomers, Masaki Morimoto and Hisashi Hirabayashi, sent a radio signal towards a star called Altair, 16.7 light years away. Using a Stanford University ...