Regulus, the brightest star in the constellation Leo. It is also called Alpha Leonis and Cor Leonis. Regulus has a magnitude of 1.36 and is about 84 light-years distant from the earth. In 1959 the planet Venus passed between Regulus and the earth, giving astronomers a rare opportunity to study the upper atmosphere of Venus by observing changes in the light of Regulus as it went into and out of eclipse.
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?
The sun warms our planet every day, provides the light by which we see and is necessary for life on Earth. But what is it exactly, and what will happen when it burns itself out?