Site Glossary

A form of energy thought to be responsible for the accelerating expansion of the Universe.

unseen matter inferred mainly from its gravitational effects.

the proposed large distribution of dark matter surrounding a galaxy.

Cells produced by cell division.

A decrease in speed.

A change in the shape or size of an object.

A branch of a neuron that receives incoming signals.

The speed at which a simplified banked curve can provide the required centripetal acceleration without relying on friction.

the tendency of a detection method to find some types of objects more easily than others.

A dome-shaped muscle beneath the lungs that plays a major role in breathing.