The popular belief that European astronomy from the late Middle Ages and early Modern Age was more advanced than that of ...

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

Raised in the Lutheran church, Tycho was led to believe that the earth was the center of the universe, but his carefully ...

One of the youngest supernova remnants in our galaxy, Cassiopeia A glows with the energy of a star’s final breath.

Roman Emperor Septimus Severus dies, leaving the Roman Empire in the hands of his two quarrelsome sons, Caracalla and ...