Both Romulus and Remus (the names of twin brothers in the Roman foundation myth) are already in use as names for the moons of the asteroid 87 Silvia.

BBC: 'Vulcan' leads Pluto moon name vote

If the question is life - and that's one of the most profound questions we can ask, he says - the answer is almost certainly not Mars or an asteroid, but rather the icy moons orbiting distant planets like Saturn and Jupiter.

BBC: Is Nasa looking in the wrong place for life?