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The usual English proper name for Earth's natural satellite is simply Moon, with a capital M. [20] [21] The noun moon is derived from Old English mōna, which (like all its Germanic cognates) stems from Proto-Germanic *mēnōn, [22] which in turn comes from Proto-Indo-European *mēnsis "month" [23] (from earlier *mēnōt, genitive *mēneses) which may be related to the verb "measure" (of time).
Absolute magnitude (H) 1 [ 16] Angular diameter. 55 milli-arcsec [ 17] Charon ( / ˈkɛərɒn, - ən / KAIR-on, -ən or / ˈʃærən / SHAIR-ən ), [ note 1] or (134340) Pluto I, is the largest of the five known natural satellites of the dwarf planet Pluto. It has a mean radius of 606 km (377 mi).
Earthrise, taken on December 24, 1968, by Apollo 8 astronaut William Anders. Earthrise is a photograph of Earth and part of the Moon 's surface that was taken from lunar orbit by astronaut William Anders on December 24, 1968, during the Apollo 8 mission. [1] [2] [3] Nature photographer Galen Rowell described it as "the most influential ...
Astronomical object. An astronomical object, celestial object, stellar object or heavenly body is a naturally occurring physical entity, association, or structure that exists within the observable universe. [1] In astronomy, the terms object and body are often used interchangeably. However, an astronomical body or celestial body is a single ...
Of the Solar System's eight planets and its nine most likely dwarf planets, six planets and seven dwarf planets are known to be orbited by at least 300 natural satellites, or moons. At least 19 of them are large enough to be gravitationally rounded; of these, all are covered by a crust of ice except for Earth's Moon and Jupiter's Io. [1]
An Outer Rim planet that harbors flying creatures called Xandu and medicinally important plants called Reeska. Iego is surrounded by 1000 moons and at least one of these, named Millius Prime, is home to a race called the Angels. [ 61][ 3] Star Wars: The Clone Wars. 2009.
It is slightly more massive than the second most massive moon, Saturn's satellite Titan, and is more than twice as massive as the Earth's Moon. It is larger than the planet Mercury, which has a diameter of 4,880 kilometres (3,030 mi) but is only 45 percent of Mercury's mass. Ganymede is the ninth-largest object in the solar system, but the ...
The use of astronomical symbols for the Sun and Moon dates to antiquity. The forms of the symbols that appear in the original papyrus texts of Greek horoscopes are a circle with one ray () for the Sun and a crescent for the Moon. [3] The modern Sun symbol, a circle with a dot (☉), first appeared in Europe in the Renaissance.