Other particles within the disk collided and stuck together to form asteroid-sized objects named as planetesimals, some of which combined to become the asteroids, comets, moons and planets.

其它在盘状星云中的物质相互碰撞合并，形成小行星尺寸的星体，称为“星子”，一些星子相互结合，形成小行星、彗星、卫星和行星。

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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?