Special | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | ALL
The plane of the Earth's orbit about the Sun. Also the path of the Sun in the sky (on the celestial sphere) during the course of a year.
The entire range of electromagnetic radiation from radio waves through microwaves, infrared radiation, light, ultraviolet radiation, and X-rays to gamma rays.
electron degeneracy pressure
An effect of quantum physics that provides the support against gravity in a white dwarf star.
A galaxy that appears as an elliptical distribution of stars (typically old stars).
A spectral line produced when atoms of a particular type emit photons with a specific energy.
A spectrum containing emission lines. A pattern of narrow bright lines at specific wavelengths, generally superimposed on a dark background. The wavelengths of the lines are characteristic of the composition of the excited gas that produces them.
The boundary around a black hole within which the escape velocity exceeds that of light. Note that this does not consist of a solid, physical surface.
A planet orbiting a star other than the Sun. Shortened version of extrasolar planet.
The power to which a number or quantity is raised. For example, 103 is read as 'ten to the power 3' and means 10 x 10 x 10, where the exponent (or index) is '3'.