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GRB 970228, a highly luminous 80-second flash of gamma rays, was detected on Earth, providing early evidence that gamma-ray bursts occur well beyond the Milky Way.
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GRB 970228
Gamma-ray burst detected on 28 Feb 1997, the first for which an afterglow was observed
GRB 970228 was the first gamma-ray burst (GRB) for which an afterglow was observed. It was detected on 28 February 1997 at 02:58 UTC. Since 1993, physicists had predicted GRBs to be followed by a lower-energy afterglow, but until this event, GRBs had only been observed in highly…Source: Wikipedia (CC BY-SA)
Gamma ray
Penetrating form of electromagnetic radiation
A gamma ray, also known as gamma radiation (symbol γ), is a penetrating form of electromagnetic radiation arising from high-energy interactions like the radioactive decay of atomic nuclei or astronomical events like solar flares. It consists of the shortest wavelength…Source: Wikipedia (CC BY-SA)
Gamma-ray burst
Flash of gamma rays from a distant galaxy
In gamma-ray astronomy, gamma-ray bursts (GRBs) are extremely energetic events occurring in distant galaxies which represent the brightest and most powerful class of explosion in the universe. These extreme electromagnetic emissions are second only to the Big Bang as the most…Source: Wikipedia (CC BY-SA)
Milky Way
Galaxy containing the Solar System
The Milky Way or Milky Way Galaxy is the galaxy that includes the Solar System, with the name describing the galaxy's appearance from Earth: a hazy band of light seen in the night sky formed from stars in other arms of the galaxy, which are so far away that they cannot be…Source: Wikipedia (CC BY-SA)