Death stars are in the final stage of life before they explode into supernovae.

44min • , TV-PG • , Aug 18, 2009 • , CC

Without the moon, Earth would be a very different and desolate place today.

44min • , TV-PG • , Aug 25, 2009 • , CC

Thousands of objects both natural and manmade plummet through our atmosphere.

44min • , TV-PG • , Sep 01, 2009 • , CC

The Big Bang, supernovas, gamma ray bursts and other explosions in the universe.

45min • , TV-PG • , Sep 08, 2009 • , CC

Stunning rings of Saturn have mesmerized countless scientists over the centuries.

45min • , TV-PG • , Sep 15, 2009 • , CC

In this episode, our experts cook up ten ways you could destroy the earth.

45min • , TV-PG • , Sep 22, 2009 • , CC

Find out why clusters of stars and galaxies are uniquely important in the quest to understand the universe.

44min • , TV-PG • , Sep 29, 2009 • , CC

Outer space is already an essential part of America's ability to fight wars.

44min • , TV-PG • , Oct 06, 2009 • , CC

On alien planets, it rains from the sky as scalding iron.

45min • , TV-PG • , Oct 20, 2009 • , CC

They sound like the same phenomenon, but Pulsars and Quasars are very different.

45min • , TV-PG • , Oct 27, 2009 • , CC

The fantastic world of tomorrow is quickly becoming the futuristic world of today.

45min • , TV-PG • , May 29, 2007 • , CC

Ours is a universe of energy.

45min • , TV-PG • , Dec 31, 1969 • , CC