Antares is a huge star.
In a class called red supergiant,
Antares is about 850
times the diameter of our own Sun, 15 times more massive, and 10,000 times brighter.
Antares is the brightest star in the constellation of Scorpius and one of the
in all the night sky.
Located about 550 light years away,
is seen on the left surrounded by a yellowish nebula of gas which it has itself expelled.
Radiation from Antares' blue stellar
companion helps cause the nebular gas to
Far behind Antares
is the globular star cloud
M4, while the bright star on the right is