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Astronomy Dec 17, 2025

Decaying dark matter: Unidentified X-ray emission lines in galaxy cluster spectra may point the way

Scientists search for "decaying" dark matter (DDM) because it offers unique signatures like specific X-ray or gamma-ray lines or neutrino signals not seen in normal matter, potentially revealing dark matter's particle nature, ...

Astronomy Dec 15, 2025

NASA's Roman telescope will observe thousands of newfound cosmic voids

Our universe is filled with galaxies, in all directions as far as our instruments can see. Some researchers estimate that there are as many as 2 trillion galaxies in the observable universe. At first glance, these galaxies ...

Astronomy Dec 10, 2025

The Nancy Grace Roman Telescope is complete

If you feel a thrill every time we discover something new about the cosmos, then November 25th may have been a noteworthy day to you. That's the day that NASA completed assembly of the Nancy Grace Roman Telescope. The two ...

Astronomy Dec 10, 2025

Ancient supernova may hold key to universe's mysterious dark energy

Astronomers are a step closer to cracking one of the secrets of dark energy—the mysterious force believed to be causing the universe's accelerated expansion.

General Physics Dec 10, 2025

Neutrino observatories show promise for detecting light dark matter

Dark matter is an elusive type of matter that does not emit, reflect or absorb light, yet is estimated to account for most of the universe's mass. Over the past decades, many physicists worldwide have been trying to detect ...

General Physics Dec 9, 2025

CERN upbeat as China halts particle accelerator mega-project

The chief of the CERN physics laboratory says China's decision to pause its major particle accelerator project presents an "opportunity" to ensure Europe's rival plan goes ahead.

Astronomy Dec 4, 2025

Astrophysicists test a new piece of the sky to probe dark matter and dark energy

In the leading model of cosmology, most of the universe is invisible: a combined 95% is made of dark matter and dark energy. Exactly what these dark components are remains a mystery, but they have a tremendous impact on our ...

Astronomy Dec 4, 2025

NASA completes Nancy Grace Roman Space Telescope construction

NASA's next big eye on the cosmos is now fully assembled. On Nov. 25, technicians joined the inner and outer portions of the Nancy Grace Roman Space Telescope in the largest clean room at the agency's Goddard Space Flight ...

Astronomy Dec 4, 2025

Most normal matter in the universe isn't found in planets, stars or galaxies: An astronomer explains

If you look across space with a telescope, you'll see countless galaxies, most of which host large central black holes, billions of stars and their attendant planets. The universe teems with huge, spectacular objects, and ...

Astronomy Dec 4, 2025

Earlier ultra-relativistic freeze-out could revive a decades-old theory for dark matter

A new theory for the origins of dark matter suggests that fast-moving, neutrino-like dark particles could have decoupled from Standard Model particles far earlier than previous theories had suggested.

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