Orion Glossary
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
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electron degeneracy pressureAn effect of quantum physics that provides the support against gravity in a white dwarf star. | |
elliptical galaxyA galaxy that appears as an elliptical distribution of stars (typically old stars). | |
emission lineA spectral line produced when atoms of a particular type emit photons with a specific energy. | |
event horizonThe 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. | |
exoplanetA planet orbiting a star other than the Sun. Shortened version of extrasolar planet. | |
exponentThe 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'. | |
extragalacticOf or pertaining to the Universe outside our own galaxy. | |
extrasolar planetA planet orbiting a star other than the Sun. Also abbreviated to exoplanet. | |
F |
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flareA highly energetic form of solar activity, typically lasting a few hours, caused by the sudden release of magnetic energy in the corona. | |