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Using data from NASA's Fermi Gamma-ray Space Telescope and other facilities, an international team
has found the first gamma-ray binary in another galaxy.
The system, named LMC P3, was found 163,000 light-years away in a small galaxy called the
Large Magellanic Cloud
It is at the center of an expanded cloud of debris from a supernova explosion
In LMC P3, a hot, massive normal star and a neutron star orbit each other every 10.3 days
The big star is 25 to40 times the mass of our sun
It's the most luminous gamma-ray binary in gamma-rays, X-rays, radio and visible light
Fermi has detected four of these systems in our own galaxy, plus LMC P3, the first found in another galaxy.
Observing the changing emission from these binaries helps scientists understand gamma-ray
processes found in many different kinds of objects.
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