In early November 1572, observers on Earth witnessed the appearance of a "new star" in the constellation Cassiopeia, an event now recognized as the brightest naked-eye supernova in more than 400 years.

Astronomers may now know the cause of an historic supernova explosion that is an important type of object for investigating dark energy in the universe.

NEW YORK, Nov.

A team of scientists from around the world has exhumed the remains of a famous 16th century Danish astronomer in the hopes of determining, once and for all, the cause of his sudden death.

NEW YORK, Nov.