[Munch's Master]

Mass is density. Size is size. For instance, a small lead weight has a far greater mass than a big hot air balloon. So BM's correct.

But nevertheless, if there really is a planet within our reach that could have life on it, it's a huge step forward for our civilisation. If we ever reach it, then it'd be possible to either make contact with alien life, or, if there is no life on it, then colonise another planet. Sure it'd take a great length of time to get there, hundreds if not thousands of years, unless our travel methods greatly improve, but it can be done. And since it should only take a few decades until we have telescopes capable of truly examining the planet's surface, we could actually see alien life in our lifetime.
I know it's still just speculation as to whether it does have even primitive life on it, let alone civlisation, but it has me excited. I've always wanted to see proof of alien life, now we potentially could.