Study of material surrounding distant stars shows Earth's ingredients 'pretty normal'. 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. This will have implications for finding Earth-like bodies elsewhere. Source 6u.
Water-worlds are common: Exoplanets may contain vast amounts of water. Scientists have shown that water is likely to be a major component of those exoplanets (Planets orbiting other stars) which are between two to four times the size of Earth. It will have implications for the search of life in our Galaxy. Source 4q.