Right now, key measurements of the universe's expansion are contradicting each other. A lost form of dark matter could help them agree.
Roughly 80 percent of the mass of the universe appears to be dark matter: an invisible material that seems to interact with ordinary matter only through gravity, without emitting light or energy. Scientists cannot detect dark matter directly and don't yet know what it's made of, but they track its influence based on the motions of stars and galaxies. The presence of dark matter is necessary to explain the universe's current structure.
A key signal for a certain kind of dark matter failed to turn up in a search throughout the Milky Way. Now scientists are disagreeing about what that means.
Earthly slime mold models have helped astronomers map the cosmic web that connects galaxies throughout the universe.
Researchers think that a newly identified subatomic particle may have formed the universe's dark matter right after the Big Bang, approximately 13.8 billion years ago.
There's a faint gamma-ray background in the universe, and scientists now think it could be caused by dark matter.
It turns out that dark matter forms smaller "clumps" than scientists thought, confirming a fundamental prediction about the mysterious substance.
A U.S. facility — designed in part to solve the mysteries of dark matter — now officially carries the name of the scientist who concluded that the elusive substance must exist.
Nineteen newly discovered dwarf galaxies seem to be missing their dark matter, and physicists aren't sure why.
Astronomers recently completed the first test run of the nearly-complete Dark Energy Spectroscopic Instrument (DESI)
You might not recognize Peebles' name, but he theorized the existence of dark matter and has been a key player in painting the portrait of the universe that we now understand.
The Nobel Prize in physics this year has gone to two very different research threads — and danced around some big societal issues, even as they celebrate distinguished work.
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