We don't know the answer to that either, but we will learn that answer this year, thanks to NASA's Kepler Space Telescope, and in fact, the smart money, which is to say the people who work on this project, the smart money is suggesting that the fraction of planets that might be suitable for life is maybe one in a thousand, one in a hundred, something like that.
Det ved vi heller ikke, men det kommer vi til i år, takket være NASAs Keplerteleskopet. Et fornuftigt gæt, altså folkene, der arbejder på projektet, er at foreslå, at den del af planeter, der muligvis er egnede til liv, måske er én ud af tusinde, én ud af hundrede, noget i den stil.