This glossary of astronomy terms contains definitions for some of the most common words used in astronomy, cosmology, astrophysics, and space exploration. The first moon landing was in the Mare Tranquillitatis (the Sea of Tranquility). After mare rocks had been radiometrically dated, these calibrated surfaces were the key to using crater counting to date other planetary bodies. MARE (plural maria) Mare means "sea," but maria on the moon are plains on the moon. Epicycle definition, a small circle the center of which moves around in the circumference of a larger circle: used in Ptolemaic astronomy to account for observed … . Astronomical unit definition is - a unit of length used in astronomy equal to the mean distance of the earth from the sun or about 93 million miles (150 million kilometers). The amateur astronomy hobby contains words, labels, and technical terms that may seem be a little confusing for both beginners and the more experienced hobbyists. They are less reflective than the "highlands" as a result of their iron-rich composition, and hence appear dark to the naked eye. They were dubbed maria, Latin for "seas", by early astronomers who mistook them for actual seas. Crater count isochrons have been constructed for every body in the inner solar system and, with more caution, for outer solar-system bodies as well. Term Derived from Latin, albedo means "whiteness" (albus= "white").Albedo is measured on a scale from 0 to 1, where 0 refers to an object that is completely dark, i.e., it does not reflect … The Difference Between astronomy and astrology Albedo In astronomy, the term albedo refers to the brightness of an object in space. n. An adult female horse or the adult female of other equine species. The lunar maria / ˈ m ɑːr i ə / (singular: mare / ˈ m ɑːr eɪ /) are large, dark, basaltic plains on Earth's Moon, formed by ancient volcanic eruptions. maria) The Latin word for ‘sea’, originally used by Galileo in 1610 to denote the smooth, grey areas on the Moon, visible to the naked eye, that are now known to be plains of basaltic lava filling circular basins excavated by planetismal impact. An adult female horse. Astronomy definition is - the study of objects and matter outside the earth's atmosphere and of their physical and chemical properties. mare (pl. Definition A dwarf planet is an object orbiting the Sun with enough mass to gravitationally pull itself into a spherical shape, yet not enough gravity to clear out surrounding planetesimals. 1879, R[ichard] J[efferies], chapter 1, in The Amateur Poacher, London: Smith, Elder, & Co., […], OCLC 752825175: But then I had the [massive] flintlock by me for protection. Mares synonyms, Mares pronunciation, Mares translation, English dictionary definition of Mares. Basalt lavas, mainly in maria, cover 17% of the surface of the Moon, mostly on the near side. mare (mah -ree, -ray, mair -ee) (plural: maria) a large relatively smooth dark area on the surface of a planet or satellite.The word is used in the approved name of such a surface feature. (Latin: sea) They are called maria because very early astronomers thought that these areas on the moon were great seas.
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