Astrophysics and cosmology Archives – Page 31 of 59

Cosmic rays, climate and the origin of life

Cosmic rays may not influence cloud cover, but they may have a role in the phenomenon of lightning.

AGILE and Fermi see a flaring microquasar

The two currently operating high-energy gamma-ray satellites have both detected Cygnus X-3 (Cyg X-3) during episodes of strong radio flaring. These first detections of a genuine microquasar in our gal...

VERITAS observes the origin of cosmic rays

The detection of very-high energy (VHE, E> 100 GeV) gamma-rays from the starburst galaxy Messier 82 (M82) by the Very Energetic Radiation Imaging Telescope Array System (VERITAS) may...

Can invading black holes explain GRBs?

X-ray observations of gamma-ray bursts (GRBs) by the Swift satellite suggest that the central engine can be active for up to a few hours. A new theoretical study shows that this is difficult to explai...

AMS gets its slot on a space shuttle in 2010

AMS-02, the experiment that will seek dark matter, missing matter and antimatter in space aboard the International Space Station (ISS), has recently received the green light to be part of the STS-134 ...

XMM-Newton sees fast-spinning white dwarf

Using observations by ESA’s Newton X-ray multimirror satellite, XMM-Newton, a group of Italian astronomers has derived the characteristics of a peculiar binary system consisting of a white dwarf...

Cosmology

Massimo Giovannini reviews in 2015 Cosmology by Steven Weinberg.

Telescopes pin down location of cosmic accelerator

Teams have joined forces with astronomers to reveal the precise location of particle acceleration in the nearby giant radio galaxy M87.

Galactic positrons are not from dark matter

A new study on the propagation of positrons in the galaxy suggests that dark-matter annihilation or decay is not required to account for gamma-ray observations by ESA’s INTEGRAL satellite. It sh...