Astrophysics and cosmology Archives – Page 31 of 59

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...

Cosmic leptons challenge dark-matter detection

Recent data favour an astrophysical explanation for cosmic-ray features.

Playing with Planets

Herbi Dreiner reviews in 2009 Playing with Planets.

The ESA Planck spacecraft heads off to its final destination after successful launch

Planck, ESA's new spacecraft to map the cosmic microwave background, successfully took its first steps into space on 14 May when it was launched together with the far-infrared space telescope Hersche...

XMM-Newton observes emission from matter around a black hole

A recent observation by the XMM-Newton satellite revealed two prominent emission lines in the X-ray spectrum of the Seyfert galaxy 1H 0707-495.

Fermi measures the spectrum of cosmic-ray electrons and positrons

The Fermi Gamma-Ray Telescope can find out about more than gamma rays. It has now provided the most accurate measurement of the spectrum of cosmic-ray electrons and positrons. These results are consis...