Legend has it that Isaac Newton had the moment of inspiration that would lead to his theory of gravity when, on a warm ...

Gravity, despite its pervasive influence, is the weakest fundamental force, easily overcome even by simple actions like lifting a pencil. While achieving and maintaining orbit requires significant ...

Planets start as messy clumps of rock and dust. Gravity pulls everything toward the center. Over time, this force smooths out the shape. That is why planets become round.