How much do you really know about Mars? Or Neptune? Or Saturn? PBS’ “Nova” arguably is the most appropriate television series to administer that quiz, and it does so with the five-part presentation ...

In this video segment adapted from NOVA scienceNOW, learn about the debate over the definition of a planet. Historically, there has been no scientific definition for a planet, leaving astronomers with ...

Scientists have been looking for extra-solar planets for decades, but only recently, with better equipment and improved techniques, have they finally unveiled new and unusual planets. Since 1995, over ...

This photograph, as seen in the PBS series “NOVA: The Planets,” is a NASA satellite image showing Jupiter covered in storms. Thousands of kilometers across, these ...

Proxima Centauri, the sun’s nearest neighbor among the stars, is 25 trillion miles away from Earth. Even if it had a family of planets, no telescope could reveal them. According to Sir James Jeans, a ...