With their dramatic, glowing tails and cyclical appearances, comets fire the imagination, fuel scientific exploration and draw eyes to the skies.
Text by Greg Thilmont | Photo editing by Connie Ricca
- Storm knocks out power to 250,000
The ice storm is heading towards North Carolina and Virginia after hitting Texas and Louisiana hard.
- Avalanche threat continues for the Pacific Northwest
- Seen from space: Pacaya pops
- Asteroid gives Earth super-close shave today
- Good wildflower blooms expected in Texas
- How the famous marshmallow study explains environmental conservation