Venus is hotter than Mercury because of its thick atmosphere. According to NASA, Venus' atmosphere is 96 percent carbon dioxide, which holds in heat. Mercury has a very thin atmosphere that does not keep heat on the planet.
The thick layer of carbon dioxide that surrounds Venus acts as a greenhouse. The gases let the heat from the sun in, but do not allow it to leave. This is the same process that happens on Earth with the increased amount of greenhouse gases, though it is much more severe on Venus because the atmosphere of Venus is around 90 times as thick. According to Discovery, carbon dioxide absorbs the heat that Venus tries to give off at night and keeps it on the planet, increasing the surface temperature to around 900 degrees Fahrenheit. The carbon dioxide also causes severe winds and storms on the surface of the planet, making it even more inhospitable.
Mercury has a thin atmosphere with a variety of gases. Because of this, the atmosphere does not have a severe greenhouse effect that acts as a blanket over the planet like Venus. Instead, the heat given off by the Sun is more easily siphoned off during the night.Learn More
The oval path that the Earth takes around the sun is called an elliptical orbit. The elliptical orbit was introduced to the world through the work of Johannes Kepler.Full Answer >
The most recent Mars rover, called Curiosity, landed on Aug. 6, 2012, on the Aeolis Palus plain near the Gale Crater. Three previous rovers successfully landed on Mars, including the Sojourner on July 4, 1997; Spirit on Jan. 3, 2004; and Opportunity on Jan. 24, 2004.Full Answer >
It takes Jupiter 4,332 days or 11.86 Earth years to orbit the sun. Because it is further away from the sun than Earth, it's orbital period is much longer.Full Answer >
Mars is 142 million miles from the Sun and takes 687 Earth days to complete one orbit around the sun, according to the National Aeronautics and Space Administration. The average surface temperature on Mars is -81 degrees Fahrenheit, and the small red planet has a much weaker gravitational pull than that of Earth. Mars also has 15 percent of the volume of Earth.Full Answer >