orbits of stars near the galactic center

Click on the image to animate this loop of the motion of stars (Labeled “S0”) near the center of the Milky Way. While the object marked with a star is invisible in infrared light, the orbits of the stars reveal its mass to be 4 million times that of the Sun, but it takes up less space than the Solar System. The only object fitting the bill is a supermassive black hole. [Credit: Keck/UCLA]

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