Venus is known to most scientists as the sister planet to the Earth. It is called this because it closely resembles the Earth's mass, density and diameter. The only thing different is that Venus is shrouded in thick clouds that completely hide the surface of the planet. The surface temperature is also much warmer than that of Earth.
Venus completes one revolution around the sun in 224.7 days. This makes the Venusian day equal to 117 earth days. It is thought that this slow rotation may be the reason why Venus has no magnetic field.
.
The atmosphere of Venus made up of 98% carbon dioxide and 2% Nitrogen. This atmosphere also has the presence of helium, neon and argon. This is yet another thing, which makes Venus different from Earth. .
The surface of Venus is quite a bit like that of the Earth. The surface has volcanoes and smooth plains. Much of the volcanic activity on Venus takes the form of basaltic eruptions. One thing that differs from Earth is that there is no water liquid on the Venusian surface.
The average distance from the sun is 108.20 Km. The equatorial diameter is 12,012 Km and the equatorial rotation is 243 days. Finally the mass of Venus is 4.87*10^24 Venus, although different than Earth, is still our sister planet.
.
Mars is the fourth furthest away from the sun and is recognized by its reddish color. Mars is also very much like the Earth. More than any other planet in the solar system, Mars has characteristics that make it an Earth-like world.
One thing that is very similar to Earth is the rotation period. Mars's rotation period is only thirty seven minutes longer than the Earth's. This would explain why Mars has significant seasonal changes just as Earth does. It is believed that the difference between winter and summer on Mars is even greater than.
on Earth. .
Mars is extremely hard to understand due to the effect of blurring that is caused by the two atmospheres of Mars.