Meet the author: Dr. Phil Plait is an astronomer, author, and science communicator with a PhD in astronomy at the University of Virginia. He has written four books on astronomy and consulted on space ...

Catch two transits of Io, spot sparkling star clusters, and view Mars at aphelion while the April Full Moon lights the sky this week.

In a star’s core, fusion takes terrific temperature and pressure that is provided by the crushing gravity of the star’s overlying mass. For a star to be relatively stable, the outward force of the ...

Four planets in the solar system are about to appear in alignment in the night sky. Here's how stargazers will be able to see ...

Cancer can read any room they enter. Thanks to their rulership of the Moon, they are one of the most psychic star signs. This ...