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February 13 2013

How Jupiter Moon Europa's Underground Ocean Was Discovered


Nineteen seventy-seven was the kind of year that only comes around once every 176 years. That’s how often the outer planets of our solar system (Jupiter, Saturn, Uranus and Neptune — sorry, Pluto) line up just right in their orbits around the sun to allow for a spacecraft to slingshot past all four of them.

Rather than wait until 2153, NASA decided to take advantage of the opportunity of ‘77. The space agency launched the twin 1-ton space probe emissaries, Voyager 1 and Voyager 2, from Florida's Cape Canaveral in September and August of that year, respectively.

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