Learn about the life and scientific contributions of Johannes Kepler, the 17th-century astronomer known for his laws of ...

How did the great modern scientific adventure related to the discovery and study of celestial bodies and the cosmos begin?

In 1920, astronomers Harlow Shapley and Heber Curtis held a Great Debate. Shapley argued that the spiral nebulae were small and in the Milky Way, while Curtis took a more radical position that they ...

The dwarf planet 1 Ceres is in conjunction with the Sun at 5 P.M. EST today. While this means we can't see Ceres for now, we ...

Anyone up late for Valentine’s Day night could catch a rocket going off. SpaceX crews are preparing to launch a Falcon 9 ...

As more satellites, telescopes, and other spacecraft are built to be repairable, it will take reliable trajectories for ...