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Kelvin-Helmholtz instability on the Sun makes vortices spaced 50 to 65 km apart, a new study finds.

Having shown the massive star Betelgeuse as an indistinct blob, astronomers at the Very Large Telescope in the Atacama Desert have now imaged its long-suspected companion star, proving that the ...

Fast blue optical transients flare brighter than supernovas and fade far faster -- rare, blue, and still unexplained.