Astrophysics and cosmology Archives – Page 8 of 58

Exploring the Hubble tension

Cosmologist and theoretical physicist Licia Verde discusses the current tension between early- and late-time measurements of the expansion rate of the universe.

Accelerators meet gravitational waves

Gravitational waves crease and stretch the fabric of spacetime as they ripple out across the universe, potentially causing observable effects on beams in storage rings.

ANAIS challenges DAMA dark-matter claim

First results from the ANAIS experiment show no annual modulation, in conflict with longstanding results from the DAMA experiment.

Lifting the veil on supernova 1987A

High-energy X-rays reveal possible missing neutron star formed by the collapse of the famous supernova's progenitor star.

Cosmic plasma-wakefield acceleration

Recent studies suggest that plasma-wakefield acceleration also occurs naturally, potentially explaining the highest energy cosmic rays.

NANOGrav uses pulsate to detect potential distortions in space time

Pulsars hint at low-frequency gravitational waves

Observations of millisecond pulsars by the NANOGrav collaboration show early signs of consistency with gravitational waves with a period of decades.

Weinberg on astrophysics

Steven Weinberg has penned a concise account of the foundations of astrophysics of permanent value, writes our reviewer.

Borexino, located at Gran Sasso National Laboratory in Italy, comprises almost 300 tonnes of well-shielded ultrapure liquid scintillator surrounded by 2200 photomultipliers and is designed to detect sub-MeV solar neutrinos. Credit: Borexino collaboration.

Neutrinos confirm rare solar fusion process

The Borexino collaboration has used an ingenious analysis to provide the first direct proof of the CNO cycle.

Researchers grapple with XENON1T excess

The excess could be due to a difficult-to-constrain tritium background, solar axions or solar neutrinos with a Majorana nature, says the collaboration.