extragalactic background light
How Much Light Has The Universe Created Since the Big Bang?
The universe, most cosmologists tell us, began with a bang. At some point, the lights turned on. How much light…
11 years ago
Bright Blazar’s Emission Defies Explanations
When it comes to sheer wattage, blazars definitely rule. As the brightest of active galactic nuclei, these sources of extreme…
12 years ago
Fermi Measures Light from All the Stars That Have Ever Existed
This plot shows the locations of 150 blazars (green dots) used in the a new by the Fermi Gamma-Ray Telescope.…
12 years ago