Approximately 4.6 billion years ago, our solar system formed from a cloud of gas and dust called a solar nebula that swirled around, eventually collapsing under its own gravity into a rapidly rotating ...

A team of researchers recently reported that a little over 4 pounds of helium-3 leak out of Earth every year, an indication that our planet formed in a solar nebula. Helium-3 is a very ancient isotope ...

In 1687, Sir Isaac Newton published his magnum opus, Philosophiæ Naturalis Principia Mathematica, which effectively synthesized his theories on motion, velocity, and universal gravitation. In terms of ...