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Theorists intrigued by hints of weakening dark energy in largest yet 3D galaxy map.
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NASA's JWST telescope traces burst to a supernova but finds a puzzling lack of heavy elements.
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NSF faces choice between multibillion-dollar projects after board sets cost cap.
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Quantum memories and networks could help combine light from widely separated mirrors.
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eROSITA telescope shows galaxies' "clumpiness" matches predicted effect of dark energy, dark matter.
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NASA's JWST telescope spots fluorescing gas inflamed by surviving neutron star.
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Rethink of familiar object may boost odds that its name, offensive to some, will be changed.
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To zoom in farther, Event Horizon Telescope wants to add more radio dishes to its network-and go to space.
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Agency says orbiting power stations would be costly, but rocketry breakthroughs could make it economical.
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Researchers seek protection for pristine areas on Moon's far side and polar regions.
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Past the halfway point, Extremely Large Telescope prepares to receive first mirrors.
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Researchers share prize for attosecond laser flashes that capture the motion of electrons.
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Researchers share award for developing quantum dots, which fluoresce in vivid colors determined by their size.
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Controversial astrophysicist says metallic spheres hail from outside the Solar System, but others say it's "nonsense".
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With approval imminent, construction will soon begin on Cherenkov Telescope Array.
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Black hole 40 million times the Sun's mass formed puzzlingly fast.
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Groundbreaking XRISM will capture spectra, revealing the motion and composition of million-degree gases.
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A European space telescope sets off to discover the nature of dark energy-the biggest ingredient in the universe.
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Closely packed telescope dishes enable wide-field, real-time sky surveys.