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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 contention as targets of missions for future human generations.
YR4, which orbits the sun every four years and periodically crosses Earth's orbit. The nature of its orbit makes it a ...
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 ...
Astronomers believe thousands of large undiscovered asteroids, that could cause regional damage, may be in space.
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