Pionic helium In this experiment, a pion – shown here with one orange and one blue particle representing its quark and anti-quark – replaces one of the two electrons in the helium atom. This new ...

AFTER the discovery by Urey of the isotope of hydrogen of mass 2 (deuterium) and its concentration by electrolysis, it was natural to examine whether any other stable isotopes of hydrogen, and ...

The outer hydrogen layers of the stars have been ripped away by a companion star, leaving them as an exposed helium star. When you purchase through links on our site, we may earn an affiliate ...

On today's show: Four Planet Money stories that aired on the radio but haven't yet made it into the show.

The Varian Pro2 Helium Leak Detector is a portalbe helium mass spectrometer to measure any leakage in vacuum systems. The use of helium in leak detection is widely recognize throughout the vacuum ...