Where did all the dust come from? If you are interested in the origin of planets and human beings, here’s evidence that a star explosion made mucho dust.

The Why Files looks at kinesiology, sports medicine, psychology and some ancient Olympic history, brought to life.

The solar clock doesn’t quite line up with the atomic clock. We use leap seconds to make them match. Should we dump the leap second?

How does an atomic clock work? How does an atomic fountain work? Is there a limit to the accuracy of an atomic clock?

Think you know the Milky Way, our home galaxy? Think again. There’s a large bar at the center, and it’s open for business. It might even be feeding a black hole… Meet the newest galactic doo-dad…

In astronomy, it helps to get above it all. Three cool orbiting telescopes are collecting visible, infrared and X-ray light. We ogle their greatest hits.

Before planets, there was dust. But gravity doesn’t affect dust. So how did the planets form before solar wind blew all the dust away? Experiment shows that dust in planetary nebulas was coated with sticky ice.

Neutrinos are everywhere, but catching these tiny particles is one of the toughest tasks in physics. A giant neutrino experiment is starting up in Illinois. Want to go visit?

Cassini finds lightning strikes on Saturn, haze on moon Titan, dust between the rings, and new rotation rate.

New view of crystals that form into planets in protoplanetary disks. Which came first, the planet or the crystals?