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Cosmology

Researchers calculate all the photons ever emitted by the observable universe and find an astronomical number.

Charles Q. Choi, Contributor

Theoretical physicists come up with a new way to analyze the firework of signals coming from particle collision experiments.

Yuen Yiu, Staff Writer

Physicists come up with alternate explanation of gravity that may implicate dark energy, which comprises 70 percent of our universe.

Yuen Yiu, Staff Writer

Physicists speculate that decaying neutrons may be producing particles unknown to science that make up the elusive dark matter.

Charles Q. Choi, Contributor

Enjoy a rainbow of pictures this month, featuring Hubble's 28th anniversary image and the richest image of the Milky Way Galaxy yet.

Abigail Malate, Staff Illustrator

Signal hints at possible interactions between ordinary hydrogen and dark matter in the early universe, but some scientists remain skeptical.

Ramin Skibba, Contributor

About 100 years ago Henrietta Swan Leavitt helped prove the existence of other galaxies. She is still inspiring astronomers today (infographic).

Abigail Malate, Staff Illustrator

The gigantic celestial body has exploded multiple times, confounding scientists.

Yuen Yiu, Staff Writer

The signal, from two merging black holes 3 billion light-years away, is the most distant observation yet.

Yuen Yiu, Staff Writer

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