Study of material surrounding distant stars shows Earth`s ingredients `pretty normal`
(PHYSorg.com Space & Earth)

The Earth`s building blocks seem to be built from `pretty normal` ingredients, according to researchers working with the world`s most powerful telescopes. Scientists have measured the compositions of 18 different planetary systems from up to 456 light years away and compared them to ours, and found that many elements are present in similar proportions to those found on Earth.