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Elusive Planet Nine could be surrounded by hot moons, and that's how we'd find itThe mysterious Planet Nine may have up to 20 moons that could be superheated by the hypothetical planet's gravitational pull, making them easy to spot.
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Gigantic 'alien' comet spotted heading straight for the sunScientists think it may have come from another solar system
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Does gravity make you age more slowly?If you're at sea level, or you age more slowly or faster than someone at the top of Mount Everest?
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Magnificent ring of stars captured by Hubble is the result of two galaxies in head-on collisionA pair of galaxies in the constellation Eridanus have been warped and twisted into a colossal, glowing ring of stars by the intense gravitational forces between them following a chaotic merger.
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Lopsided star cluster may disprove Newton and Einstein, controversial new study claimsAn uneven distribution of stars in several nearby clusters may offer evidence of MOND – a controversial theory of gravity that disputes Newton and rejects the existence of dark matter.
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Mars may be slowly ripping its largest moon apartA new study has revealed that the weird parallel grooves on the surface of Mars' largest moon Phobos could be a sign that the Red Planet's gravity is ripping the satellite apart.
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Something is wrong with Einstein's theory of gravityAlbert Einstein’s theory of general relativity has been remarkably successful in describing the gravity of stars and planets, but it doesn’t seem to apply perfectly on all scales.
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What is the shape of the universe?The universe may be vast, but researchers have multiple points of evidence that reveal its shape.
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Stunningly perfect 'Einstein ring' captured by James Webb Space TelescopeA new image using data collected by NASA's James Webb Space Telescope shows off one of the most perfect "Einstein rings" ever captured.
