The Sleeping Beast -Milk Way's Super massive Black Hole
Astronomers have long wondered why it is that the super-massive black hole in the center of our galaxy, known as Sagittarius A*, containing about 4 million times the mass of our Sun is relatively quiet.. Yet, despite its size, the energy radiated from its surroundings is billions of times weaker than black holes at the core of other galaxies. In fact, it was a million times brighter three centuries ago when must have unleashed an incredibly powerful flare.
"We have wondered why the Milky Way’s black hole appears to be a slumbering giant," saysTatsuya Inui of Kyoto University in Japan. "But now we realize that the black hole was far more active in the past. Perhaps it’s just resting after a major outburst."
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