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nountufted evergreen perennial herb having spikes of tiny white flowers and glossy green round to heart-shaped leaves that become coppery to maroon or purplish in fall
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"`extragalactic nebula' is a former name for `galaxy'"noun(astronomy) a collection of star systems; any of the billions of systems each having many stars and nebulae and dust
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nouna splendid assemblage (especially of famous people)type of:
Definition that contains galaxy
- galactic of or relating to a galaxy (especially our galaxy the Milky Way)
- andromeda a constellation in the northern hemisphere between Cassiopeia and Pegasus; contains the Andromeda galaxy
- milky way system the galaxy containing the solar system; consists of millions of stars that can be seen as a diffuse band of light stretching across the night sky
- spiral nebula a galaxy having a spiral structure; arms containing younger stars spiral out from old stars at the center
- hubble constant (cosmology) the ratio of the speed of recession of a galaxy (due to the expansion of the universe) to its distance from the observer; the Hubble constant is not actually a constant, but is regarded as measuring the expansion rate today
- jan hendrix oort Dutch astronomer who proved that the galaxy is rotating and proposed the existence of the Oort cloud (1900-1992)
- extragalactic outside or beyond a galaxy
- oort Dutch astronomer who proved that the galaxy is rotating and proposed the existence of the Oort cloud (1900-1992)
- hubble parameter (cosmology) the ratio of the speed of recession of a galaxy (due to the expansion of the universe) to its distance from the observer; the Hubble constant is not actually a constant, but is regarded as measuring the expansion rate today
- milky way the galaxy containing the solar system; consists of millions of stars that can be seen as a diffuse band of light stretching across the night sky