Binary star systems—that is, two stars that orbit one another—are pretty rare. Gamma-ray binary systems, which are made up of either black holes or neutron stars and radiate most of their energy in gamma rays, are even rarer. Hear about the first such system to be discovered beyond our own galaxy in the video below.
NASA's Fermi Telescope Finds Record-Breaking Binary Star
It's the first to be found outside of our galaxy, and the most luminous ever witnessed.
What Are Binary Star Systems?
Find out what happens when two or more stars interact.
Neutron Stars Explained
Hear about how something as dense and massive as a neutron star can exist.
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