Comets will never look the same now that NASA’s Deep Impact spacecraft has successfully slammed into one of the icy wanderers in full view of orbital observatories, ground-based telescopes and skywatchers around the world.

Theory of 'co-evolution' dramatically alters dark reputation.

Earth's extremes! Highest, lowest, hottest places. Deadliest volcanoes and earthquakes. More!

Anyone with a passing interest in the fate of the planet can remove some of the mystery regarding the effects of the next collision.