Even if the planet had life, scientists now knew, finding it would be extremely hard.
WHY would Earth be radically different if the planet hadn't shed most of its early chlorine?
But if the planet is small and the moon is large, it is not.
If the planet has lakes or oceans, it would increase the chances of life evolving there.
But for others, a different kind of progress is necessary if the planet is to survive.
And if the planet happens to be saved on the way, that is all to the good.
(If the planet had a sufficiently massive atmosphere, winds would redistribute heat and the atmosphere would not freeze).
Brown said he would be surprised if the planet was not found in the next five years.
If the planet was sucked into a black hole, would she find herself orbiting a supernova for eternity?
If the planet has an atmosphere or an ocean, he says, the redistribution of heat could be possible.
Several small island states could be swallowed by rising seas if the planet warms by 2C, scientists believe.
