What's the diameter of Sagittarius A*?

Are you talking about the super-massive black hole at the center of the Milky Way? Because if so, the correct way to type its name is “Sagittarius A*,” not “Sagittarius A star. read more

Sagittarius A* has a diameter of 44 million kilometres, roughly equalling the distance from Mercury to the Sun (46 million km). Sgr A* emits a large amount of IR, gamma-rays and X-rays. It appears motionless, but there are clouds of dust and gas orbiting it, which provides a clue to the nature of the object. read more

Sagittarius A* (pronounced "Sagittarius A-star", standard abbreviation Sgr A*) is a bright and very compact astronomical radio source at the center of the Milky Way, near the border of the constellations Sagittarius and Scorpius. read more