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For example, Titan looks bigger than Ganymede, but its solid body is smaller. For the giant planets , the "radius" is defined as the distance from the center at which the atmosphere reaches 1 bar of atmospheric pressure.
All planets listed are smaller than Earth and Venus, ... Mercury: 0.3826 Shown for comparison: ... Mars: 0.5325 Shown for comparison ...
Mars may have yet-undiscovered moons, smaller than 50 to 100 metres (160 to 330 ft) in diameter, and a dust ring is predicted to exist between Phobos and Deimos. [ 203 ] A third possibility for their origin as satellites of Mars is the involvement of a third body or a type of impact disruption.
Mercury's axial tilt is almost zero, [114] with the best measured value as low as 0.027 degrees. [115] This is significantly smaller than that of Jupiter, which has the second smallest axial tilt of all planets at 3.1 degrees.
All nine are similar to terrestrial planets in having a solid surface, but they are made of ice and rock rather than rock and metal. Moreover, all of them are smaller than Mercury, with Pluto being the largest known dwarf planet and Eris being the most massive. [34] [35]
The following outline is provided as an overview of and topical guide to Mars: Mars – fourth planet from the Sun and the second-smallest planet in the Solar System , after Mercury . Named after the Roman god of war , it is often referred to as the " Red Planet " [ 1 ] [ 2 ] because the iron oxide prevalent on its surface gives it a reddish ...
[4] [5] Mercury's surface shows intercrater plains, basins, smooth plains, craters, and tectonic features. Mercury's oldest surface is its intercrater plains, [4] [6] which are present (but much less extensive) on the Moon. The intercrater plains are level to gently rolling terrain that occur between and around large craters.
46 Gm – perihelion distance of Mercury (yellow ellipse on the right) 55 Gm – 60,000-year perigee of Mars (last achieved on 27 August 2003) 58 Gm – average passing distance between Earth and Mars at the moment they overtake each other in their orbits; 61 Gm – diameter of Aldebaran, a red giant branch star (large star on right) [178]