The High Energy Universe
- Extra Reading
View the sky through an x-ray telescope and the conception of the universe changes dramatically. Black holes are best seen in x-rays, because impinging gas collides with the black hole at near light speed, resulting in intense x-ray and gamma ray emission.
Optical light also plays a role in discovering black holes since the most luminous objects in the universe emit bursts of gamma radiation which only lasts minutes, but leaves an optical afterglow.
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