Scientists accidentally discovered a giant ring-shaped cosmic megastructure that challenges our understanding of the Universe

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A view of many stars and galaxies, all white and yellow light with starry streaks coming off them
Euclid's view of globular cluster NGC 6397

European Space Agency/Euclid Consortium/NASA; image processing by J.-C. Cuillandre, G. Anselmi

The Green Comet will be closest to earth on Feb 1. Here's the science behind its ghoulish glow.

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green comet streaking across starry night sky with long white tail
Comet ZTF, as photographed on January 18, 2023.

Dan Bartlett

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