Astrophysics and Cosmology

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.

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

An optical device that separates light into its component wavelengths.

detecting light from a planet itself.

change in observed wavelength caused by relative motion.