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New measurements could upend the standard theory of the cosmos that has reigned since the discovery of dark energy 21 years ago.
After an interstellar asteroid shot past the sun, scientists realized that there’s probably a lot of itinerant rocks out there.
Astronomers have discovered a complex planetary system still swirling into existence.
Astronomers are puzzling over a paucity of planets in the galaxy measuring between 1.5 and two times Earth’s size.
The astrophysicist Janna Levin reflects on the newly unveiled, first-ever photograph of a black hole.