Mercury, Venus, Earth and Mars. Contrasting: Temerpatures vary widely between all four terrestrial planets. Jupiter, Saturn, Uranus and Neptune. One orbits closer to the Sun, and one orbits more distant to the Sun. Each planet orbiting our sun is unique. Mars and Venus are the two terrestrial planets most similar to Earth. Planet Compare Solar System News Bill Allen has thrived as the mechanical systems design lead for three Mars rover missions, but he got his start as a teen sorting letters for the NASA center. So, it can rightly be said that Venus is Earth’s twin. Mercury and Venus have no natural satellites, Earth has just one, Mars has two. The Atmospheres of Venus, Earth, and Mars: A Critical Comparison. The chart for Venus up to the dashed arrow describes the runaway greenhouse process that happened several hundred million to a few billion years ago. THE OUTER PLANETS. Earth is the largest of the Inner Planets, with a diameter of 12,756 km (7,926 miles). Climates on both these planets are quite different. The start of the period of large-scale human effects on this planet (the Anthropocene) is debated. The planets can be divided into two groups. Jupiter four moons. Planetary scientists theorize that Mars and Venus may once have had conditions like Earth's, favorable to life. Focusing now just on Earth and its closest neighbors, we can compare just the three terrestrial planets, Venus, Earth, and Mars, and we find that, although they have many things in common as we just mentioned, they are also worlds apart in many equally important respects. Mercury, Venus, Earth and Mars are terrestrial or telluric planets. Compare and contrast asteroids and comets. It shows the histories side-by-side so it is easier to compare the planet histories. Jupiter, Saturn, Uranus, and Neptune are grouped as the Jovian or gas giant planets, because of their large sizes and gas-rich compositions. Small size. Again, when it comes to mass, mass only possesses 10% of the Earth’s mass while Venus possesses 81% of the mass of Earth. They are small and are composed of rock and metal, like the Earth. This is a flowchart summary of the histories of the terrestrial planet atmospheres (Venus, Earth, and Mars). Mercury, Venus, Earth and Mars form the terrestrial planets. Since the 1990s, the increasingly rapid discovery of extrasolar planets (planets orbiting other stars) has turned the traditional division of planets into rocky or terrestrial planets (like Earth and Mars) and Jovian planets or gas giants (like Jupiter and Saturn) from a handy shorthand for our own solar system into what seems to be an accurate classification of all known planets. Earth and Mars both have natural satellites. Earth Venus and Mars all have atmospheres. They are rocky with a dense metal core consisting mostly of iron. Climatic Differences Between Mars And Venus. 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