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It takes two Astronomers have observed X-rays and visible light from two short gamma-ray bursts for the first time. The observations suggest that the bursts are caused by the collision of two neutron stars, or a neutron star and a black hole.
Although gamma-ray bursts were first observed more than 30 years ago, they are still not fully understood. Often described as the most powerful explosions in the universe, they have durations that range from about one hundred seconds to just a few milliseconds.
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