What is the significance of the object Sagittarius A* ("Sagittarius A-star") in our Galaxy?
A) It appears to be a jet of material ejected from an accretion disk around a supermassive black hole in the galactic nucleus.
B) It is a globular cluster passing close to the galactic nucleus,and the RR Lyrae stars in it allow the distance to the galactic center to be calculated.
C) It is a bright,high-speed cloud of gas close to the galactic nucleus,which allows the mass of the nucleus to be calculated.
D) It appears to be the actual nucleus of the Galaxy.
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