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  1. Space

    50 years ago, NASA prepared to launch America’s first space station

    In 1970, NASA was building Skylab. The orbiting laboratory led to many scientific firsts but was plagued by technical difficulties.

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  2. Astronomy

    Pinning down the sun’s birthplace just got more complicated

    Many astronomers think that the sun was born in a loose association of thousands of stars. A new study suggests there’s another possibility.

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  3. Physics

    A giant underground motion sensor in Germany tracks Earth’s wobbles

    A giant underground gyroscope array has taken its first measurements of how the world goes ’round.

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  4. Earth

    An asteroid impact, not volcanism, may have made Earth unlivable for dinosaurs

    New simulations add to growing evidence that an asteroid strike, rather than the Deccan Traps eruptions, caused the end-Cretaceous extinction.