Scientists are now trying to work out what caused the mystery burst .
, which has not yet been peer reviewed or published in a scientific journal, the researchers say the flash happened over a two-hour time span. They said the increase in brightness could suggest a change in activity at the supermassive black hole. Another cause could be a change to its accretion state—how the black hole is drawing matter inwards. The team also suggests current models about the flux levels of Sagittarius A* may be insufficient.
S0-2 is the closest star to Sagittarius A*, orbiting the black hole about once every 16 years and traveling at around three percent of the speed of light. It has been watched by researchers at UCLA and Germany's Max Planck Institute for over 20 years. A huge dust cloud known as G2 also came extremely close to Sagittarius A*recently.
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