Top Science Discoveries

Tectonic plates are composed of two types of lithosphere: thicker continental and thin oceanic.

Many predictions of general relativity differ significantly from those of classical physics.

Halley's returns to the inner solar system have been observed and recorded by astronomers since at least 240 BC.

Babylonian astronomers in the first millennium BC observed that the Sun's motion along the ecliptic was not uniform, though they were unaware of why this was; it is today known that this is due to the Earth moving in an elliptic orbit around the Sun, with the Earth moving faster when it is nearer to the Sun at perihelion and moving slower when it is farther away at aphelion.

A technique used to date materials such as rocks, usually based on a comparison between the observed abundance of a naturally occurring radioactive isotope and its decay products, using known decay rates.