Can it be true?

Will we find a twin of the Earth in the next few years?  Some scientists think that is a possibility as they have found many - perhaps a few thousand, perhaps billions - planets that are about our size and may have liquid water.  They've come to that conclusion from work done with NASA's Kepler spacecraft.  One of these planets may be as 'close' as 12 light years and visible to the naked eye.

While almost ecstatic, the scientists have doubts as, although these planets are Earth-size, nobody knows what their masses are and thus whether they are rocky like the Earth, or balls of ice or gas, let alone whether anything can, or does — or ever will — live on them.