News tagged with gamma rays

The evidence for pair-instability supernovae

A supernova is a stellar explosion. They can occur when a large star exhausts its ability to fuse hydrogen into higher elements, and its core collapses. The resulting rebound rips apart the outer layers of ...

Oct 06, 2014
4.9 / 5 (20) 5

How gamma ray telescopes work

Yesterday I talked about the detection of gamma ray bursts, intense blasts of gamma rays that occasionally appear in distant galaxies. Gamma ray bursts were only detected when gamma ray satellites were put ...

Sep 22, 2014
5 / 5 (5) 0

The frequency of high-energy gamma ray bursts

In the 1960s a series of satellites were built as part of Project Vela.  Project Vela was intended to detect violations of the 1963 ban on above ground testing of nuclear weapons.  The Vela satellites were ...

Sep 22, 2014
5 / 5 (2) 0

Mystery of rare five-hour space explosion explained

Next week in St. Petersburg, Russia, scientists on an international team that includes Penn State University astronomers will present a paper that provides a simple explanation for mysterious ultra-long gamma-ray ...

Sep 17, 2014
4.2 / 5 (27) 36

Fermi finds a 'transformer' pulsar

(Phys.org) —In late June 2013, an exceptional binary containing a rapidly spinning neutron star underwent a dramatic change in behavior never before observed. The pulsar's radio beacon vanished, while at ...

Jul 22, 2014
4.8 / 5 (24) 7

Upgraded telescope opens window to universe

An international team of astrophysicists including University of Adelaide researchers have announced the successful detection of pulsed gamma rays from the neutron star, the Vela pulsar, using their newly upgraded telescope ...

Jul 18, 2014
4.7 / 5 (3) 0