Mercury's revolution is 88 Earth days. A planet's revolution is the time it takes to make one complete orbit around the sun. This is different than Mercury's rotation period, which is the time it takes this planet to spin about its axis.
Mercury's rotation period is 59 Earth days. Mercury is an inner planet that is also the closest to the sun. Mercury is a small planet with an equatorial diameter of 4,879 kilometers. Mercury's gravity is 38 percent that of the Earth's. Mercury does not have moons associated with it. However, it does have many craters as the result of collisions from asteroids and comets.
Named after the Roman god Mercury, this planet was known to the ancient Assyrians. In 1974 and 1975, the spacecraft Mariner 10 was able to map out a portion of Mercury's surface.Learn More
Uranus is composed largely of hydrogen and helium like the other gas giants. It also has water ice, methane ice and ammonia ice. There are also tiny amounts of carbon monoxide, carbon dioxide and hydrocarbons such as ethane, acetylene, diacetylene and methylacetylene.Full Answer >
The word "planet" in Greek means "wanderer." Planets were thought to be moving against the still background of stars. The planets move, or revolve, around the sun in relatively fixed orbits.Full Answer >
The interiors of the Jovian planets, also known as gas giants, are different because of their sizes. Jupiter and Saturn, the largest of the four Jovian planets, are massive enough to compress materials into a rocky core. Uranus and Neptune exert less pressure, which causes their cores to be in an icy, liquid state.Full Answer >
Venus does not have any rings. The planet does not have rings because the temperature on Venus is too high for their formation. Rings are associated with the outer planets of Jupiter, Saturn, Neptune and UranusFull Answer >