宇宙 (2007) 季 4 字幕下载

Season 4 opens with an exploration of dying stars, the process where stars become supernovas, and, occasionally, become...

Without the moon, Earth would be a very different and desolate place today--four hours of sunlight with pitch-black nigh...

Every year, thousands of objects both natural and manmade plummet through our atmosphere and crash into the Earth. These...

An examination of the most powerful explosions and blasts in the universe. Includes a look at the Mexico's Yucatán penin...

They are breathtaking, lethal and a constant source of surprise. The stunning rings of Saturn have mesmerized countless...

Experts cook up ways you could destroy the Earth, including swallowing it with a black hole, blowing it up with anti-mat...

They are the one-stop-shopping places for learning all about the nature and variety of stars in the Universe. They're un...

Outer space is already an essential part of America's ability to fight wars. Our military depends on satellites for many...

On alien planets, they rain from the sky as scalding iron. On distant moons, even at hundreds of degrees below zero, the...

They sort of sound like the same phenomenon, but Pulsars and Quasars are very different. Pulsars are tiny--only a few mi...

Warp speed, transporters, wormholes and lasers--they are all staples of science fiction books, movies, and TV shows. But...

Ours is a universe of energy, from powerful jets ejected from black holes to the raw nuclear fury of our Sun. But, the t...