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Misguided Lunar eclipse – a phenomenon caused by the Earth passing between the sun and moon. Multiparous Cosmic microwave background: Microwave radiation that permeates the universe and represents the still cooling heat generated in the universe. Cosmogony EnchantedLearning.com is a user-supported site. They can also be formed by collisions between planetesimals. They appear in the form of luminous bands, streamers, or the like. A branch of science that deals with studying the origin, structure, and nature of the universe. Mendacious Galilean Moons Mirror – Piece of glass coated with a highly reflective material. Kuiper Belt Also known as the northern lights, this is an atmospheric phenomenon that displays a diffuse glow in the sky in the northern hemisphere. Middle-Class Glossary of Terms | Astronomy FAQ | Messier Catalog | Astronomical Calendar Marginal Diffraction – Spreading out of light as it passes the edge of an obstacle. Chondrule Distance light travels in a unit of time through a specific substance. If one of the bodies is sufficiently massive compared with the other two, then the triangular configuration is apparently stable. The following are terms from A-Z related to space & astronomy: -A- Absolute magnitude – also known as absolute visual magnitude, relates to measuring a heavenly object’s brightness when viewed from […] It is a class of galaxies that emit a large amount of energy from their center more than ordinary galaxies. The degree of brightness of a star or other object in the sky according to a scale on which the brightest star has a magnitude -1.4 and the faintest visible star has magnitude 6. The property of being anisotropic and having a different value when measured in different directions. A shift in the lines of an object's spectrum toward the red end. Solar Cycle Anisotropy is the state of being directionally dependent. Radiation pressure – Amount of pressure applied on a surface by electromagnetic radiation or light. Nebulae represent the raw material the stars are made of. Equinoxes signal the start of spring and autumn seasons that occur on or near March 21 and September 22, respectively. Our galaxy, the Milky Way, is a spiral galaxy. The shape of the Van Allen belts is determined by the Earth's magnetic field. Standard candle – In astronomy, refers to an object known for its brightness and is sometimes used to determine distances. Microgravity – A condition the force of gravity is very low, producing a near-weightless environment. Parallax – Shift of a nearby object against a fixed background due to the movement of the observer. Apparent magnitude is the visible brightness of an object from Earth. An instrument that uses lenses and sometimes mirrors to collect large amounts of light from distant objects and enable direct observation and photography. A stone meteorite that contains no chondrules. Mushy Universal time is used by astronomers as a standard measure of time. Supermoon Here is a list of Descriptive Words that begin with Letter M. Total letter M words: 245 words. An imaginary sphere around the Earth on which the stars and planets appear to be positioned. Baryon is a proton, neutron, or any elementary particle that decays into a set of particles that includes a proton. Minimalist The usually appear black on visible light photographs of the Sun. Newton's Third Law of Motion Also called a binary asteroid. Declination – Angular distance of an object in the sky, above or below the celestial equator. On the Moon, the maria are the smooth, dark-colored areas. Monumental Wolf-Rayet star – Luminous and hot star having temperatures reaching 90,000 kelvins. Some galaxies are so distant the their light takes millions of years to reach the Earth. A planet orbits the Sun in an ellipse with the Sun at one focus. Stellar wind – Torrent of charged atomic particles emanating from stars. A large grouping of stars. A grouping of stars that make an imaginary picture in the sky. An imaginary belt across the sky in which the Sun, moon, and all of the planets can always be found. A small planetary body in orbit around the Sun, larger than a meteoroid but smaller than a planet. Optics – Study of light and its properties; Lenses or mirrors. O-type star – A hot, massive blue star that emits strongly at ultraviolet wavelengths and has a surface temperature of roughly between 28,000 to 40,000 Kelvin’s. Cosmic Ray Mongoloid Averted vision – a technique to view faint objects using peripheral vision. Density Zenith hourly rate – Meteorites expected to be viewed per hour during a meteor shower, where the meteor showers radiance is at an observer’s zenith. The part of the Sun's atmosphere just above the surface. Active optics – Technology developed in the 80’s for reflecting telescopes. Periastron – Location in an objects orbit where it is closest to the star it orbits. Number of neutrons and electrons may vary. Magnificent One bar is equal to 0.987 atmospheres, 1.02 kg/cm2, 100 kilopascal, and 14.5 lbs/square inch. Hypered film – Film that has been treated, usually with gas, to enhance its response to low light levels. Escape Velocity Double Star Heliopause The leading apex of the triangle is known as the leading Lagrange point or L4; the trailing apex is the trailing Lagrange point or L5. Dark adaptation – The ability of the human eye to adjust seeing dim objects in the dark. They were named after the scientist who first noticed them. Jansky Moody A planet at opposition is at its closest approach to the Earth and is best suitable for observing. Mountainous The apparent change in position of two objects viewed from different locations. Irregular Satellite Macaronic Solstice – Two points on the celestial sphere wherein the sun is farthest north or south of the equator. Tidal Heating Antimatter The orbit of a satellite where the satellite travels in a direction opposite to that direction of the planet's rotation. Full moon – Phase of the moon when it is halfway around its orbit from new moon and opposite the sun in the sky; the full disk is illuminated. Galaxy – an enormous gravitationally bound assemblage of millions or billions of stars. Miniscule Binoculars are optical devices providing good depth effect for both eyes. Absolute magnitude measures how bright an object would appear if it were exactly 10 parsecs (about 33 light-years) away from Earth. YourDictionary’s Word Finder provides you with words to focus on, each A phenomenon that occurs when the Moon passes into the shadow of the Earth. Memorial Circumstellar Disk Some can even be accompanied by a sonic boom. An event that occurs when two or more celestial objects appear close close together in the sky. Gravitational lensing results in duplicate images of distant objects. Double Asteroid Macedonian Chandrasekhar limit: named after Indian astrophysicist Subrahmanyan Chandrasekhar, is the mass limit above which a star has too much mass to become a white dwarf after gravitational collapse. Bolometric magnitude includes a star's entire spectrum of radiation, not just the visible light. Prime meridian – The line of longitude that runs through Greenwich, England. To search this site, type your search word(s) in the In a system where no external forces are present, every action force is always opposed by an equal and opposite reaction. Ionosphere Also known as the poles, this is an imaginary line through the center of rotation of an object. A collection of young stars that formed together. Evolved Star The temperature at which the motion of all atoms and molecules stops and no heat is given off.

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