The Milky Way's "Sleeping Monster" --Astronomers Ponder the Next Awakening

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. 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.

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