gravity
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Euclid telescope spots rare 'Einstein ring' hiding near Earth — and an ancient, unnamed galaxy behind itEinstein predicted the existence of gravitationally-warped rings of light in 1915. Now, a new one has been discovered just a cosmic stone's throw from our own planet.
By Ben Turner Published
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How do Hula-Hoops work?How do Hula-Hoops keep from falling down as we twirl them around?
By Charles Choi Published
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Scientists still don't fully understand why some planets have hundreds of moons while others have noneIt's not a competition, but if it were, Saturn would be winning.
By Nicole Granucci Published
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Why does Earth look flat if it's really round?It's all about perspective: The higher you go, the more you can see the curve.
By Kelly R. MacGregor Published
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How long does it take to travel to the moon?The answer depends on many factors, including the amount of fuel needed, the moon's orbit and the mission's objectives.
By Drew Turney Published
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Indian Ocean gravity hole: The dent in Earth's gravitational field created by the death of an ancient oceanThe Indian Ocean "gravity hole" is a region where Earth's mass is reduced, leading to weak gravitational pull, lower-than-average sea levels and a puzzle scientists have only just begun to solve.
By Sascha Pare Published
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James Webb telescope uncovers 1st-ever 'Einstein zig-zag' hiding in plain sight — and it could help save cosmologyA new JWST study has revealed the true origins of a luminous quasar that has been duplicated six times as its light "zig-zags" through space-time via a phenomenon first predicted by Albert Einstein. The unusual light show could help tackle one of cosmology's biggest problems, experts claim.
By Harry Baker Published
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'Gravity waves' from Hurricane Helene seen rippling through the sky in new NASA imagesHurricane Helene sent gravity waves rippling through the atmosphere far above the southeastern United States, new NASA images reveal.
By Stephanie Pappas Published
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'God of chaos' asteroid may be transformed by tremors and landslides during 2029 flyby of Earth, study findsWhen the 'God of chaos' asteroid Apophis makes an ultraclose flyby of Earth in 2029, our planet's gravity may trigger tremors and landslides that totally change the asteroid's surface.
By Deepa Jain Published
