A total solar eclipse will be visible from Texas to Maine on Monday. This cosmic event occurs when the Earth, sun, and moon align perfectly. One diagram shows how a total solar eclipse works, and why ...

Look up in the sky: It's a bird! It's a plane! No, it's the moon covering the sun. In just a few days a total solar eclipse will arrive in North America, and people are already pretty excited. But, ...

These days, we are treated to glorious images of the cosmos through astrophotography and sophisticated three-dimensional visualizations of the universe. In the early centuries of astronomy, however, ...