of bombs), half of any amount decays within about 87 years. On a spacecraft, Pu-238's decay gives off lasting warmth that helps safeguard fragile electronics. Most importantly, wrapping Pu-238 with thermoelectric materials that convert heat to electricity, forms a bewilderingly long-lasting power source.of Pu-238 left to put inside a spacecraft — enough for another two or three spacecraft.
By 1988, dozens of similar spacecraft — four of them using nuclear power sources — made up a rudimentary satellite navigation network. The map of the anomalies became the first of Earth's geoid, a representation of the planet's true gravitational shape. It's now essential to correcting the orbits of satellites.Apollo 11 astronauts in July 1969 dropped off about 1.2 ounces of Pu-238 on the moon.
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It's a God-awful small affair To the girl with the mousy hair But her mummy is yelling no And her daddy has told her to go But her friend is nowhere to be seen Now she walks through her sunken dream To the seat with the clearest view And she's hooked to the silver screen
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