3I/ATLAS’ Sunward anti-tail didn’t disappear after it reached its closest point to the Sun, adding to the mystery. To Loeb, this would imply that there’s a “new pocket of ice near the opposite pole of the rotation axis, that gives rise to a prominent new anti-tail jet after perihelion.”

With 3I/ATLAS slated to make its Earth tour in two days, amateur photographers and astronomers alike are scrambling to catch sight of the interstellar comet. Our intergalactic visitor will officially make its closest approach on December 19.

Visitors to the Sunwheel can see the sun rising and setting over the winter solstice stones from approximately Dec. 16 through Dec. 26. During this period the sun appears to rise at a fixed spot on the southeast horizon and set in a fixed southwest direction for more than a week.

Astronomers using the James Webb Space Telescope report that a powerful gamma-ray burst detected in March may have been produced by the explosion of a massive star just 730 million years after the Big Bang.

Among the more puzzling cosmic phenomena discovered over the past few decades are brief and very bright flashes of blue and ultraviolet light that gradually fade away, leaving behind faint X-ray and radio emissions.

Cosmic dawn galaxies seen by JWST reveal hidden clues about dark matter and keep rival theories about its true nature alive.

Across modern astronomy, the most striking pattern is not a single spectacular discovery but a drumbeat of similar clues. Wherever telescopes and probes look with enough sensitivity, they keep turning up the same life-friendly ingredients, from complex ...

Researchers have found a razor-thin, rotating string of galaxies inside a massive cosmic filament, revealing unexpected alignments that challenge models of how galaxies gain their spin. An internation

The first pulsar was discovered in 1967 by Jocelyn Bell Burnell. Finding these mysterious signals forever changed astronomy.

For around a year now, the Sidewalk Astronomers have been meeting regularly in D.C. to show people that gazing at the stars can be accessible to anyone.