The universe has long captivated us with its immense scales of distance and time. How far does it stretch? Where does it end and what lies beyond its star fields and streams of galaxies extending as far as telescopes can see?
 | 10th Planet  | 5:00 | A stunning discovery at the far reaches of our solar system... |
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 | Dark Matter  | 13:00 | Turns out most of the universe is held together by a... |
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| |  | Life on Mars?  | 3:14 | The Phoenix lander is sent to Mars to search the arctic plains... |
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|  | Origins  | 50:00 | How did the colossal forces of the early universe make it... |
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 | Pulsar Planets  | 3:11 | If pulsar planets could support life, it would be a life filled... |
| |  | Space Elevator  | 11:41 | Can we build a 22,000-mile-high cable to transport cargo and... |
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