From Citizendium, the Citizens' Compendium
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- Astronomy : The study of objects and processes in the observable universe, e.g. stars, planets, comets or asteroids.
- Electromagnetic radiation : a collection of electromagnetic waves, usually of different wavelengths.
- Galaxy rotation curve : Graph of a galaxies curve, represented by a plot of the orbital velocity of the stars or gas in the galaxy on the y-axis against the distance from the center of the galaxy on the x-axis.
- Gravitational lens : A lens formed when light from a very distant, bright source (such as a quasar) is 'bent' around a massive object (such as a cluster of galaxies) between the source object and the observer.
- Gravitation : The tendency of objects with mass to accelerate toward each other.
- International Ultraviolet Explorer : An astronomical satellite designed primarily to observe ultraviolet spectra.
- Johann Christian Andreas Doppler : (29 November 1803 - 17 March 1853) Austrian mathematician and physicist, who in 1842 discovered the 'Doppler effect', where the observed frequency of a wave depends on the velocity of the source relative to the observer.
- Milky Way : The Milky Way galaxy which contains our solar system.
- NGC 205 : A small, elliptical satellite galaxy of the Andromeda Galaxy.
- NGC 221 : NGC 221 or Messier 32, is an elliptical satellite galaxy of the Andromeda Galaxy
- Special relativity : Theory of the effects of motion on observations of things such as length, time, mass and energy. The theory is based on the postulates that all laws of physics are the same in all inertial reference systems, and that the vacuum speed of light is a universal constant, independent of the speed of the source.
- Universe : The summation of all particles and energy that exist and the space-time in which all events occur.
- Z (letter) : The twenty-sixth and last letter of the English alphabet.