Canopus, the second brightest star in the night sky. (Sirius is the brightest.) Canopus is in the constellation Carina. The star is visible in the southern United States and elsewhere below 37 north latitude. Canopus has an apparent magnitude of -0.72 and an absolute magnitude of approximately -3.5. It is approximately 115 light-years from the earth.
Until recently, most people assumed that if Mars had liquid water, it no longer did and hadn't for quite some time. But scientists have recently noticed some anomalies in photos of Mars that may suggest there is water. Could there be life, too?
Hundred of meteors fly across the sky every night, but only a few make it to Earth. Meteors are best known for the brilliant streaks of light they make as they burn up in the atmosphere. Learn about 10 memorable meteor crashes that left an impression.