Astronomers find missing type of quasar . Universe weighed and 'found wanting' . Forests a blaze of colour from space . Astronomers find missing type of quasa . Scientists Find Evidence For Wet, Slushy Gannymede, Jupiter's Largest Moon .
Rare meteorites rekindle controversy over birth of the solar system .
Volcanic Ash Detector Boosts Air Safety . A forgotten form of air transport is due for a revival . Astronomers describe search for habitable planets beyond solar system as new observatories detect molecules of life . Fighting forest fires from space . Galaxy formation not random, says astronomer .