About This Lesson
The topics covered in today's espisode of The Countdown are: a bizarre asteroid with six tails spotted by the Hubble Telescope, liftoff! India's first Mars probe launches toward the Red Planet, the Kepler Telescope finds a plethora of Earth-size planets, Chelyabinsk eyewitnesses help scientists resolve meteor mysteries and gravity maps reveal why the Moon's far side is covered with craters
