It has a thin atmosphere, which causes it to swing between burning and freezing temperatures
Mercury is also a dense planet, composed mostly of iron and nickel with an iron core
Its magnetic field is only about 1 percent that of Earth’s
The surface of Mercury is similar to that of the Moon; it has many deep craters and is covered by a thin layer of tiny particle silicates
The surface temperature of Mercury is hot enough to melt lead on the sunny side of the planet and with its year only taking 88 days, it is whipping around the Sun! Mercury's close proximity to the Sun's gravity-well requires application of Einstein's general theory of relativity to calculate the precession of the perihelion of its orbit, classical mechanics would not work. Venus
Has a thick toxic atmosphere that traps heat, making it the hottest planet in the solar system.
Much of its surface is marked with volcanoes and deep canyons, the biggest of which is 4,000 miles long.
Only two spacecraft have ever penetrated Venus’s thick atmosphere. And it’s not just spacecraft that have trouble getting through the atmosphere; there are fewer crater impacts on Venus than other planets, because all but the largest meteors can’t make it through the thick air.
Venus is not a nice place to visit with its atmosphere full of carbon dioxide and sulfuric acid. The extreme temperatures on its surface – over 480°C or 900°F – makes it another planet that you don't want to bring any lead to! Oh, by the way, the atmospheric pressure on the surface is about 92 tivmes higher than it is on Earth. Between the extreme temperature, pressure and acidic atmosphere Earth
Of the four terrestrial planets, Earth is the largest, and the only one that has liquid water, which is necessary for life as we know it. Like the other terrestrial