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4 tiny, Earth-like planets found circling 2nd-closest star system to us — and could be visited by future human generationsA quartet of small, rocky exoplanets likely circle Barnard's Star, around 6 billion light-years from Earth, putting them in ...
Sue Nelson explores how asteroids can inform our understanding of the Earth's past – or threaten our future. Each year, according to Nasa, a chunk of rock the size of a car hurtles through space ...
YR4, which orbits the sun every four years and periodically crosses Earth's orbit. The nature of its orbit makes it a ...
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