Just about every two years, the planet Mars makes its closest approach to Earth around 36 million miles. Thats when we pack our robotic emissaries off to the Red Planet, timing their launches to spend the least effort to get there.
 | 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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