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Glossary of Astronomy Terms
beginning with letter M
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magnetopause Tweet Definition of magnetopause Like Definition of magnetopause on Facebook
noun
  1. the boundary between the Earth's magnetosphere and the sun's plasma
magnetosphere Tweet Definition of magnetosphere Like Definition of magnetosphere on Facebook
noun
  1. (physics) the comet-shaped region around the Earth, shaped by the solar wind and the Earth's magnetic field, in which charged particles are trapped or deflected
manger Tweet Definition of manger Like Definition of manger on Facebook
noun
  1. A trough for animals to eat from.
mare Tweet Definition of mare Like Definition of mare on Facebook
noun
  1. An adult female horse.
Mars Tweet Definition of Mars Like Definition of Mars on Facebook
proper noun
  1. The Roman god of war.
  2. The fourth planet in the solar system. Symbol:
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mean solar day Tweet Definition of mean solar day Like Definition of mean solar day on Facebook
noun
  1. the average length of a solar day, used for practical timekeeping
Mensa Tweet Definition of Mensa Like Definition of Mensa on Facebook
proper noun
  1. w:Mensa International, Mensa International; an organisation for people with very high IQs.
mercurial Tweet Definition of mercurial Like Definition of mercurial on Facebook
noun
  1. A chemical containing mercury.
adjective
  1. Relating to the Roman god Mercury.
  2. Relating to the planet Mercury.
  3. Having characteristics of the Roman god Mercury, such as speed.
  4. contain, Containing the element mercury.
  5. volatile, Volatile.
Mercury Tweet Definition of Mercury Like Definition of Mercury on Facebook
proper noun
  1. The Roman god associated with speed, sometimes used as a messenger. He wore winged sandals. Mercury corresponded to the Greek god Hermes.
  2. The planet in the solar system with the closest orbit to the Sun, named after the god; represented by ☿.
meridian Tweet Definition of meridian Like Definition of meridian on Facebook
noun
  1. An imaginary great circle on the Earth's surface, passing through the geographic poles.
  2. Either half of such a great circle, all points of which have the same longitude.
  3. (astronomy) A great circle passing through the poles of the celestial sphere and the zenith for a particular observer.
  4. (mathematics) A similar line on any general surface of revolution.
  5. Any of the longitudinal pathways on the body along which the acupuncture points are distributed.
  6. The highest point or state of consciousness and enlightenment achievable by a human.
adjective
  1. Meridional; relating to a meridian.
  2. Relating to noon
meteoric Tweet Definition of meteoric Like Definition of meteoric on Facebook
adjective
  1. Of, pertaining to, or originating from a meteor.
  2. Like a meteor in speed, brilliance, or ephemeralness.
His rise to power was followed by a slow, lackluster career at the top.
meteorite Tweet Definition of meteorite Like Definition of meteorite on Facebook
noun
  1. A metallic or stony object or body that is the remains of a meteor
meteoroid Tweet Definition of meteoroid Like Definition of meteoroid on Facebook
noun
  1. (astronomy) A relatively small (sand- to boulder-sized) fragment of debris in a solar system that produces a meteor when it hits the atmosphere
microscope Tweet Definition of microscope Like Definition of microscope on Facebook
noun
  1. An optical instrument used for observing small objects.
  2. Any instrument for imaging very small objects (such as an electron microscope).
Microscopium Tweet Definition of Microscopium Like Definition of Microscopium on Facebook
proper noun
  1. (constellation) A faint constellation of the southern spring sky, said to resemble a microscope. It lies south of the constellation of Capricornus.
Mira Tweet Definition of Mira Like Definition of Mira on Facebook
proper noun
  1. (star) A binary star in the constellation Cetus; Omicron (ο) Botis. The system contains a variable red giant and a white dwarf. Its brightness varies from a magnitude 2 at its brightest to a magnitude 10 at its dimmest.
Miranda Tweet Definition of Miranda Like Definition of Miranda on Facebook
proper noun
  1. (given name, female)
  2. The smallest of Uranus' moons.
verb
  1. To read somebody their rights on arrest as set out in Miranda v Arizona.
    • Has the suspect been Mirandaed?
    • McCarthy? provided that he was Mirandaed. I told her to videotape or to have someone videotape the conversation. http://www.courts.state.me.us/opinions/ 2003%20documents/03me40mc.pdf
Monoceros Tweet Definition of Monoceros Like Definition of Monoceros on Facebook
proper noun
  1. (constellation) A winter constellation of the northern sky, said to resemble a unicorn. It lies amid the Milky Way, just east of the constellation Orion.
month Tweet Definition of month Like Definition of month on Facebook
noun
  1. A period into which a year is divided, historically based on the phases of the moon. In the Gregorian calendar there are twelve months: January, February, March, April, May, June, July, August, September, October, November and December.
  2. A period of 30 days, 31 days, or some alternation thereof.
Moon Tweet Definition of Moon Like Definition of Moon on Facebook
proper noun
  1. The Earth's moon; the sole natural satellite of the Earth, represented in astronomy and astrology by ☾.
moonrise Tweet Definition of moonrise Like Definition of moonrise on Facebook
noun
  1. when the moon begins to rise.
moonscape Tweet Definition of moonscape Like Definition of moonscape on Facebook
noun
  1. A view of an area of the Moon
  2. (context, by extension) A desolate or devastated landscape
moonset Tweet Definition of moonset Like Definition of moonset on Facebook
noun
  1. The setting of the moon below the horizon
morning star Tweet Definition of morning star Like Definition of morning star on Facebook
noun (plural morning stars)
  1. The planet Venus as seen in the eastern sky at dawn.
    • The evening star is the morning star. (Hesperus is Phosphorus.)
      1. (Weapon) A weapon consisting of a heavy ball set with spikes, attached to a staff and NOT suspended from one by a chain. The Morning star is a rigid weapon, sometimes called a holy water sprinkler. It is frequently confused with the flail. The flail is any weapon with a joint allowing an end to swing freely, such as a ball and chain.
      Quotations
    • 1786: Contrivances like these, except that the balls were armed with spikes, were long carried by the pioneers of the trained bands, or city militia, they are generally called morning stars. &mdash; Francis Grose, A Treatise on Ancient Armour and Weapons, page 55.
Musca Tweet Definition of Musca Like Definition of Musca on Facebook
proper noun
  1. (constellation) An autumn constellation of the southern sky, said to resemble a fly. It lies between the constellations of Carina and Apus.

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