NASA and Paris Observatory astronomers discover that the Lovejoy comet has been emitting ethyl alcohol and simple sugar by its tail.
When it passes by Earth in November, the comet ISON may burn brighter than the moon.
Thin polymer nanosuits protect insects when Japanese scientists put them in a vacuum. The discovery could have applications for space travel in the future.
Scientists now claim that a comet, not an asteroid, caused the dinosaurs' demise.
Comets like this week's Pan-STARRS may hold the key to life on Earth, study finds.
Panstarrs comet will be visible in Northern Hemisphere beginning March 7.
Asteroid 2012 DA14 will pass within 17,000 miles of Earth next Friday.