In astronomy, a regular moon or a regular satellite is a natural satellite following a relatively close, stable, and circular orbit which is generally aligned to its primary's equator. They form within discs of debris and gas that once surrounded their primary, usually the aftermath of a large collision or leftover material accumulated from the protoplanetary disc. Young regular moons then begin to accumulate material within the circumplanetary disc in a process similar to planetary accretion, as opposed to irregular moons, which formed independently before being captured into orbit around the primary.
Regular moons are extremely diverse in their physical characteristics. The largest regular moons are massive enough to be gravitationally rounded, with two regular moons—Ganymede and Titan—being larger than the planet Mercury. Large regular moons also support varied and complex geology. Several are known to have atmospheres, although only one regular moon—Titan—hosts a significant atmosphere capable of supporting weather and climate. As a result of their complexity, the rounded regular moons are often considered planetary objects in their own right by planetary scientists.[1] In contrast, the smallest regular moons lack active geology. Most are heavily cratered and irregular in shape, often resembling small asteroids and other minor bodies in appearance.
Six of the eight planets of the Solar System host 60 regular satellites[a] combined, with the four giant planets—Jupiter, Saturn, Uranus, and Neptune—hosting the most extensive and complex regular satellite systems. At least four of the nine likeliest dwarf planets also host regular moon systems: Pluto, Eris, Haumea, and Orcus.
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In astronomy, a regularmoon or a regular satellite is a natural satellite following a relatively close, stable, and circular orbit which is generally...
once been a regular satellite that was significantly perturbed to its current position when Triton was captured. Neptune's outermost moon S/2021 N 1,...
vector is non-zero Regularmoon, a natural satellite that has low eccentricity and a relatively close and prograde orbit Regular solutions in chemistry...
equatorial mountains among the tallest in the solar system. Of the known moons, 24 are regular satellites; they have prograde orbits not greatly inclined to Saturn's...
and the eighth-largest moon in the Solar System, about one-twentieth the mass of the Earth's Moon. The orbits of the regularmoons are nearly coplanar with...
the Solar System have regular orbits, while most of the small natural satellites have irregular orbits. The Moon and the Moons of Pluto are exceptions...
A regular expression (shortened as regex or regexp), sometimes referred to as rational expression, is a sequence of characters that specifies a match...
(orbiting planets or dwarf planets). Moons are classed into two separate categories according to their orbits: regularmoons, which have prograde orbits (they...
comprising just 0.003% of the total orbiting mass. Of Jupiter's moons, eight are regular satellites with prograde and nearly circular orbits that are not...
about half a degree on the celestial sphere, each hour. The Moon differs from most regular satellites of other planets in that its orbit is closer to the...
Crane. Other regular characters include: his father Martin, his brother Niles, producer Roz Doyle, and his live-in caregiver Daphne Moon. Other minor...
These characters appear in the American animated television series Regular Show, created by J. G. Quintel for Cartoon Network. The series revolves around...
A lunar phase or Moon phase is the apparent shape of the Moon's directly sunlit portion as viewed from the Earth (because the Moon is tidally locked with...
Keith John Moon (23 August 1946 – 7 September 1978) was an English musician who was the drummer for the rock band the Who. Regarded as one of the greatest...
Moon landing conspiracy theories claim that some or all elements of the Apollo program and the associated Moon landings were hoaxes staged by NASA, possibly...
blue moon refers either to the presence of a second full moon in a calendar month, to the third full moon in a season containing four, or to a moon that...
The Dark Side of the Moon is the eighth studio album by the English rock band Pink Floyd, released on 1 March 1973 by Harvest Records in the UK and Capitol...
Regular Show is an American animated sitcom created by J. G. Quintel that aired on Cartoon Network from September 6, 2010, to January 16, 2017. The series...
Korinna Moon Bloodgood (born September 20, 1975), known by her stage name Moon Bloodgood, is an American actress and model, known for her role as Lieutenant...
of the regular season), Moon's Eskimos were throttled in Winnipeg by the Blue Bombers in the West semi-final. In his six years in the CFL, Moon amassed...
Moon Knight is a character appearing in American comic books published by Marvel Comics. Created by writer Doug Moench and artist Don Perlin, the character...
Administration (NASA), which succeeded in preparing and landing the first men on the Moon from 1968 to 1972. It was first conceived in 1960 during President Dwight...
16–24, 1969) was the American spaceflight that first landed humans on the Moon. Commander Neil Armstrong and Lunar Module Pilot Buzz Aldrin landed the Apollo...
as the planet is forming, a moon will orbit the planet in the same direction as the planet is rotating and is a regularmoon. If an object is formed elsewhere...