In the constellation Ursa Major Approximately 1,000 times the
mass of the Sun Diameter equal to the size of Mars X-ray views
from Chandra X-Ray Observatory show a flare-up from the possible
black hole. The black hole is just to the right of the green
cross, which marks the galaxy's center. It is much brighter in
the second view than the first. [NASA/SAO/CXC] This document was
last modified: August 29, 2011.