Venus is the slowest — it rotates once every days —- by far the slowest rotation period of any of the major planets. A Venusian sidereal day thus lasts more than a Venusian year versus Venus, which is right next to Mercury, has the least eccentric orbit of any of the planet in the Solar System. Its orbit ranges between million km and million km from the Sun and has an eccentricity of. Short answer: Mercury. Long answer: Mercury is the only planet in our Solar System that has no substantial atmosphere.
Lower orbits are faster with a higher orbital velocity. Higher orbits are slower with a slower orbital velocity. Home » Nature. See also Which Africa is the richest? When heard as musical pitches, these moons are playing the same note but in different octaves because their frequencies are related by factors of 2.
This indicates that the orbits of the moons were carefully tuned to each other shortly after they formed while they were still migrating through a disk that encircled Jupiter.
It turns out that the 4th moon Callisto is dancing to the beat of its own drum. When sped up to produce a pitch, this pattern creates the interval of an octave plus a minor 3rd, adding a dark twist to the purity of the inner three moons. Have you ever seen footage of a car wheel spinning so fast that it appears to stop and start spinning backwards? When the frame rate of video footage is too slow to accurately represent a spinning wheel or an orbiting planet, your brain fills in the gaps between the frames it does capture, making it appear to rotate at different speeds or in the opposite direction.
Ganymede is the largest moon in the solar system larger than the planet Mercury , and is the only moon known to have its own internally generated magnetic field. Callisto's surface is extremely heavily cratered and ancient—a visible record of events from the early history of the solar system.
However, the very few small craters on Callisto indicate a small degree of current surface activity. The interiors of Io, Europa and Ganymede have a layered structure as does Earth. Io has a core, and a mantle of at least partially molten rock, topped by a crust of solid rock coated with sulfur compounds. Europa and Ganymede both have a core; a rock envelope around the core; a thick, soft ice layer; and a thin crust of impure water ice. In the case of Europa, a global subsurface water layer probably lies just below the icy crust.
Layering at Callisto is less well defined and appears to be mainly a mixture of ice and rock. Three of the moons influence each other in an interesting way. Io is in a tug-of-war with Ganymede and Europa, and Europa's orbital period time to go around Jupiter once is twice Io's period, and Ganymede's period is twice that of Europa. In other words, every time Ganymede goes around Jupiter once, Europa makes two orbits and Io makes four orbits. The moons all keep the same face towards Jupiter as they orbit, meaning that each moon turns once on its axis for every orbit around Jupiter.
Pioneers 10 and 11 to and Voyager 1 and Voyager 2 offered striking color views and global perspectives from their flybys of the Jupiter system. However, before we substitute these values into the equation for orbital speed, we should take note of the units being used. The orbital radius of each moon is given in kilometers, and the orbital period is given in days. This means that if we substitute these values into the equation, we will get units of kilometers per day as our units for orbital speed.
These are not SI units. And usually, we would convert these into SI units to make sure all units are consistent with the formula that we are using. For this question, though, we are comparing the speeds of each moon and determining which moves the fastest along its orbit. Kilometers per day is a perfectly valid unit of speed. And we can still compare the speeds as we would if the units were meters per second.
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