Day and night occur because of the rotation of a planet around its axis. The hemisphere of the planet that faces the sun at a particular moment experiences daylight, while the opposite side experiences darkness. The Earth rotates counterclockwise from west to east.Know More
Earth takes 23 hours and 56 minutes on average to make a complete rotation with respect to the sun, which adds up to a single day every four years. This is why leap years exist, so the lost day can be made up. Day and night have different lengths throughout the year, depending on the latitude of a particular location and what season it is. For example, summer in the Northern Hemisphere has longer days than nights. At the poles, the days and nights last for six months because they are always pointed either toward or away from the sun.
When a hemisphere of the planet is facing away from the sun, it does not receive sunlight, and night occurs because residual sunlight and heat from the previous period of daylight is being used up. When Earth rotates to bring that hemisphere back into the path of the sun's rays, sunlight once again heats and lights that hemisphere.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 >