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The gamma-ray burst GRB 080319B (artist's impression pictured), the farthest object from Earth that was observable by the naked eye, was observed.
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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)
GRB 080319B
Gamma-ray burst in the constellation Boötes
GRB 080319B was a gamma-ray burst (GRB) detected by the Swift satellite at 06:12 UTC on March 19, 2008. The burst set a new record for the farthest object that was observable with the naked eye: it had a peak visual apparent magnitude of 5.8 and remained visible to human eyes…Source: Wikipedia (CC BY-SA)
Naked eye
Human vision, unaided by optical instruments
Naked eye, also called bare eye or unaided eye, is the practice of engaging in visual perception unaided by a magnifying, light-collecting optical instrument, such as a telescope or microscope, or eye protection.Source: Wikipedia (CC BY-SA)