(NASA Administrator Dan) Golden accepts that the search for life on Mars is not over. If we wanna find out what Mars is like, what its weather patterns are like, what its geology is like, where there's potential sources of water and other resources c...
And so with Magellan weve got the first chance, one of the first chances, ok, to really get a complete map and view of it. The Venusian landscape has a desert-like appearance, but its a good deal hotter than any desert on earth. On Venus its about 50...
.....green plants ultimately. When it first appeared therefore, it would have been seen as a poison, it would have been a pollutant. But gradually, through Darwinian natural selection, living organisms have become more and more used to oxygen. They'v...
Understanding how life got going on our own planet will help us target where we look for it in space, both within the solar system and beyond. Biophysicist, David Deamer, studies tide pools. A tide pool has the right mix of conditions for the formati...
...in Mars. Although it was completely wrong about Mars and everything he said about Mars practically was wrong. But, he built up interest in the planet which has carried over to this day. And, so, he was, he was quite useful to the Mars exploration...
Launched in 1977, Voyager II explored the outer planets and their weird moons, moving ever deeper into space, into regions completely mysterious to us earthlings. On board is a gold-coated phonograph record, containing 116 images of earth and its inh...
From a planet.......let me get out of here....stay where you are.... Humanoid aliens have been good business in the 20th century. B moviemakers in particular have found a winning formula in showing semi-human space creatures with their fanatical urge...
2042 A.D., powerful orbiting telescopes scour the heavens for signs of life. They focus on a dim yellow globe. Spectrum analyser results, negative, no oxygen, no life. The autotracker zooms into another world, a pale blue dot, oxygen signal affirmati...
探索世界奥秘之Supermassive Black Holes(超大质量黑洞) Unit15 In January 2000, John Dubinski set out to calculate the final fate of our galaxy, the Milky Way, and that of our nearest neighbor, Andromeda. The Andromeda galaxy is actually fa...
探索世界奥秘之Supermassive Black Holes(超大质量黑洞) Unit14 It means that Silk and Ree's theory may be right and if it is also right that supermassive black holes helped trigger star formation, then it must mean that all giant black hole...
探索世界奥秘之Supermassive Black Holes(超大质量黑洞) Unit13 Silk realized that the energy from this newly formed quasar would create intense temperature changes in the surrounding gas. This would cause the gas around the black hole and i...
探索世界奥秘之Supermassive Black Holes(超大质量黑洞) Unit12 This correlation is the most important thing we've learned about supermassive black hole so far. Astronomers are always looking for correlations. Whenever you find one that's re...
探索世界奥秘之Supermassive Black Holes(超大质量黑洞) Unit11 Those stars don't feel the black hole. They feel the rest of the stars in the galaxy. They don't know or care that the black hole is there. If you took the black hole away from...
探索世界奥秘之Supermassive Black Holes(超大质量黑洞) Unit10 If, as it now seems, every single galaxy has a black hole at its heart, this can't be a coincidence. Perhaps black holes are an essential part of what galaxies are and how they...
探索世界奥秘之Supermassive Black Holes(超大质量黑洞) Unit09 Four times a year, Ghez focuses the telescope on the stars of the very heart of our Milky Way. She is looking for the telltale high speeds that reveal the presence of a black ho...
