If that really is where is came from, it would have had to be a pretty powerful astronomical event - or an advanced alien civilisation using an astonishingly large and powerful transmitter.

It orbits too far away from its star to support liquid water or life as we know it, but scientists predict there are other stars in the system that might be good candidates for alien life.

No two seem the same. They would be like extraterrestrials among us, except that from any distance we are the ones who are unusual, alien to their more common ways of life.