Gamma ray astronomy | Wikipedia audio article
Channel: wikipedia tts
Date: 28/12/2018

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Gamma-ray_astronomy


00:01:42 1 Detector technology
00:04:46 2 Early history
00:10:11 3 1980s to 1990s
00:12:40 4 2000s &amp; 2010s
00:15:35 5 Recent observations



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SUMMARY
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Gamma-ray astronomy is the astronomical observation of gamma rays, the most energetic form of electromagnetic radiation, with photon energies above 100 keV. Radiation below 100 keV is classified as X-rays and is the subject of X-ray astronomy.

In most known cases, gamma rays from solar flare and Earth's atmosphere)are generated in the MeV range, but it is now known that gamma rays in the GeV range can also be generated by solar flares. Formerly, it was believed that gamma rays in the GeV range do not originate in the Solar System. As GeV gamma rays are important in the study of extrasolar, and especially extra-galactic astronomy, new findings may complicate some prior models and findings."Strange gamma rays from the sun may help decipher its magnetic fields"."NASA's Fermi Sees Gamma Rays from 'Hidden' Solar Flares".
The mechanisms emitting gamma rays are diverse, mostly identical with those emitting X-rays but at higher energies, including electron-positron annihilation, the inverse Compton effect, and in some cases also the decay of radioactive material (gamma decay) in space reflecting extreme events such as supernovae and hypernovae, and the behaviour of matter under extreme conditions, as in pulsars and blazars. 
The highest photon energies measured to date are in the TeV range, the record being held by the Crab Pulsar in 2004, yielding photons with as much as 80 TeV.