Question: Are we alone in the universe?

Cat Scott ? answered on 8 Mar 2016:

I’m not sure, it’s quite difficult for a planet to be able to support life – they need to be close enough to a star (like our Sun) that it’s warm, but not too close that it’s too hot becuase everything would burn.

Space scientists can use this kind of information to try and work out which planets are likely to be habitable and investigate those ones first – so hopefully we’ll find out during our lifetimes!