Dark matter

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Understanding how galaxies are arranged could be the key to figuring what causes the expansion of the universe. ESA/Hubble, NASA and S. Smartt (Queen's University Belfast)

Galaxy survey to probe why the universe is accelerating

A unique map of the galaxies in the sky could shed light on the mysteries of the universe – including dark energy and dark matter.
Looking for dark matter in the galaxy collisions such as in Abell 2744, dubbed Pandora’s Cluster. X-ray: NASA/CXC/ITA/INAF/J.Merten et al, Lensing: NASA/STScI; NAOJ/Subaru; ESO/VLT, Optical: NASA/STScI/R.Dupke

Shedding new light on the search for the ‘invisible’ dark matter

Scientists know so much about dark matter apart from what it is exactly. But are they getting any closer?
This artist’s impression of the Milky Way galaxy. The blue halo of material surrounding the galaxy indicates the expected distribution of the mysterious dark matter. ESO/L. Calçada

Dark matter and the Milky Way: more little than large

While invisible, dark matter completely dominates our Milky Way, recent measurements of just how much dark matter there is have revealed a bit of a mystery. In a paper published today in the Astrophysical…
Scary but fascinating. NASA and M. Weiss (Chandra X -ray Center)

From black holes to dark matter, an astrophysicist explains

Katherine Mack, astrophysicist at the University of Melbourne, answered questions posed by the public on Reddit. The Conversation has curated the highlights. Dark Matter How do you explain dark matter…
Virgo consortium: the web that holds the galaxies together. Rich Murray

Filaments that bind galaxies together illuminated by a quasar

According to cosmologists, galaxies are joined together by filaments, quite literally. These filaments form the cosmic web and are made of mostly dark matter, many stars and some gas. Observing these filaments…
Dark matter is still a bit of mystery. Fractured Studios

Dark matter experiment finds nothing, makes news

A US team with a highly sensitive dark matter detector has just finished its first run. It has found nothing, and that is still big news. Physicists can explain accurately the behaviour of what makes matter…
The Alpha Magnetic Spectrometer has produced results consistent with the presence of dark matter. NASA

New light on dark matter: space station magnet attracts praise

Nobel prizewinner Samuel Ting, early this morning (AEDT), announced the first results from the Alpha Magnetic Spectrometer (AMS) search for dark matter. The findings, published in Physical Review Letters…
Knowing where cosmic rays don’t come from brings scientists another step closer to determining their origin. NSF/J. Yang

An extragalactic mystery: where do high-energy cosmic rays come from?

It’s been the defining question of high-energy astrophysics for the past century: where do cosmic rays come from? New findings from the IceCube Neutrino Observatory at the South Pole have brought us closer…

Repellant dark matter confounds astronomers

In a result which has baffled astronomers at NASA’s Chandra X-ray Observatory, dark matter has been observed separating from…

Dark matter core challenges theories

The collision of several, massive galaxy clusters has left behind a clump of dark matter, potentially challenging existing…
If the signs are right, fundamental equations of cosmology may need altering. waljoris

Is life on Earth due to a quirk in the laws of physics?

A radical discovery by my colleagues and I – reported this week in Physical Review Letters – could help explain why it was possible for life (at least as we know it) to develop on Earth, but not in other…
Australian astronomers have mapped the cosmic filaments that bind the Milky Way together, which may help reveal how galaxies form. Michael Boylan-Kolchin, University of California Irvine

Scientists track silvery threads that feed the Milky Way

Australian astronomers have shed new light on the cosmic filament that binds the Milky Way together, providing new clues…

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