Venus Planet Orbit don39t miss moon and venus december 2 sky archive earthsky Orbit Planet Venus

Venus Planet Orbit don39t miss moon and venus december 2 sky archive earthsky Orbit Planet Venus

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Astronomers' current understanding of giant-planet birth predicts an episode of gas accretion that ultimately builds up the enormous size of these gaseous behemoths. According to theory, circumplanetary gas disks, that surround the forming planets during this early period, eventually become the strange nurseries that produce a giant planet's system of moons, thus creating systems of co-planar and prograde (orbiting in the same direction as the planet) natural satellites in a way similar to the many moons of Jupiter and Saturn.



and here is another

Only after Triton's orbit became circular, around its adopted parent-planet, could some of the rubble re-accrete to form the moons of Neptune that astronomers observe today. Triton's highly disruptive invasion of the Neptune system may be the reason why the moons of Neptune do not conform to the 10,000:1 ratio of mass between parent-planet and moon-offspring that literally all of the moons observed in the satellite systems of the other giant planets in our Solar System conform to.



and finally

Of the four terrestrial, rocky planets of the inner Solar System (Mercury, Venus, our Earth, and Mars), both Mercury and Venus are moonless. Earth possesses one lone Moon, but it is a very large one--the fifth largest moon in our entire Solar System, in fact. Mars, on the other hand, has two tiny misshapen moons that resemble rocky potatoes, and are lumpy and dark, as they travel in their nearly circular orbits close to the plane of the Martian equator. The Martian moons, Phobos and Deimos, are probably asteroids that were captured by Mars long ago.

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The new study was published in the April 3, 2014 issue of the journal Nature, and it may provide a solution to a long-standing mystery of lunar origins pertaining to why Earth and its lovely companion appear to sport virtually identical compositions.



The efforts of planetary scientists to determine the lunar birthday have suggested a range of ages. Some have proposed an early event, about 30 million years after our Solar System formed, while others suggested that it occurred over 50 million years and perhaps as much as 100 million years after our Sun's family took shape.



A moon is a natural body that orbits a planet, and is held in its orbit by the force of both the host planet's gravity and the gravity of the moon itself. Some planets sport moons; some do not. Most of the moons dwelling in our Solar System are frigid (and sometimes weird) little worlds, made up of ice and rock, that swarm around the outer giant, gaseous planets of our Sun's bewitching family--Jupiter, Saturn, Uranus, and Neptune. One example of such bewitching weirdness is the frozen, little icy moon Hyperion, of the ringed-planet Saturn, that looks like an icy natural sponge.