Achernar, a blue-white star in the constellation Eridanus. Achernar has an apparent magnitude of 0.5, making it one of the brightest stars in the nighttime sky. It is visible only from locations south of about 32 North latitude. The star has an absolute magnitude of -2.3 and is approximately 118 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.