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This is Scientific American's 60-Second Science. I'm Steve Mirsky. Got a minute?

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In recent days both the unmanned Antares rocket and the Virgin Galactic space plane had catastrophic failures.

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Because space is a very risky business and it always has been.

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November 5th marks the 50th anniversary of the launch of Mariner 3, America's first mission to Mars.

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But don't expect any NASA celebrations.

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The mission failed completely.

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When Mariner 3 reached space, it was supposed to unfurl solar panels.

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But a glitch kept the panels tucked away.

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With only battery power, the spacecraft went dead just eight hours and 43 minutes later.

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So Mariner 3 fell silent, although it presumably did fly past the Red Planet months later.

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Fortunately, NASA had an identical spacecraft ready for Mars.

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After hasty modifications to prevent the same problem, Mariner 4 blasted off on November 28th, 1964.

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The following July it became the first ship to fly past our planetary neighbor that we're sure of.

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But this successful mission shocked researchers.

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Back in 1964 even some respected scientists thought that Mars was home to primitive life, if not the intelligent beings that colorful astronomers like Percival Lowell imagined.

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And the cameras on Mariner 4 sent back pictures of a barren, cratered world, devoid of any obvious Martians.

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Thanks for the minute, for Scientific American's 60-Second Science. I'm Steve Mirsky.

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