See the videos: Sprites, Asteroids & ISON

Last night PBS Hawaii screened three great astronomy programs

If you missed any of them, the videos are available at:

Nova:  At the Edge of Space

The search for SPRITES, large-scale electrical discharges that occur high above thunderstorm clouds.

Nova: Asteroid: Doomsday or Payday ?

Will future asteroids trigger massive extinctions—or be mined for precious minerals?  Features Ed Lu and an update on B612’s Sentinel Mission.

COMET ENCOUNTER

Comet of the Century.

About the sun-grazing comet ISON.