Type

Supermassive

Location

in the constellation Aries

Finder Chart

Distance

100 million light-years (24.1 megaparsecs)

Mass

50 million to 100 million times the mass of the Sun

Size

Diameter from the size of Earth's orbit to the size of Mars' orbit around the Sun

Discovery Methods

• Measuring the motions of stars

Measuring the motions of stars

Because a black hole is both massive and compact, it exerts a strong gravitational pull on the material around it. Astronomers can deduce the presence of a supermassive black hole in the core of a galaxy by measuring the velocities of stars that orbit the black hole. A more-massive black hole will accelerate nearby stars to greater speeds, so the velocities of stars can reveal not only the presence of a black hole, but its mass as well.

More about black hole discovery methods »

This document was last modified: January 24, 2011.