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 ...

Earth's persistent supply of primordial helium-3, a non-replenishing isotope, poses a challenge to understanding the delivery of volatiles to the planet. A controversial theory suggests that the solar ...

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 ...