Terrestrial planet
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The term terrestrial planet derives from the Latin word for Earth, terra. It is used to describe planetary bodies which have a size, shape, and composition similar to those of Earth.
In our solar system the term comprises the four planets closest to the sun: Mercury, Venus, Earth, and Mars. The terrestrial planets are solid, spherical, and (except for Mercury) enveloped by atmosphere. The Earth is the largest of these and is the only one known to support life.
Table
List of terrestrial planets, from the innermost to the outermost:| Name | Perihelion | Aphelion | Eccentricity | Sidereal year | Inclination | Mass | Sidereal day |
|---|---|---|---|---|---|---|---|
| Mercury (planet) | 460000000000.307 AU46,000,000 km 28,583,074.843 mi |
698200000000.467 AU69,820,000 km 43,384,136.642 mi |
0.20560.206 | 87.9690.241 a87.969 da | 0.12217304763967 °0.122 rad 7.778 grad |
3.302E+230.0553 M⊕3.302e+23 kg 1.73908e-4 M♃ |
50673601,407.6 h58.65 da |
| Venus | 1074800000000.718 AU107,480,000 km 66,784,975.742 mi |
1089400000000.728 AU108,940,000 km 67,692,177.682 mi |
0.00670.0067 | 224.7010.615 a224.701 da | 0.0591666616426083.39 °0.0592 rad 3.767 grad |
4.8685E+240.815 M⊕4.8685e+24 kg 0.00256 M♃ |
-20997000-5,832.5 h-243.021 da |
| Earth | 1470900000000.983 AU147,090,000 km 91,397,488.666 mi |
1521000000001.017 AU152,100,000 km 94,510,558.339 mi |
0.016710220.0167 | 365.2563661 a365.256 da | 8.7266462599717E-075.0e-5 °8.72665e-7 rad 5.55556e-5 grad |
5.9736E+241 M⊕5.9736e+24 kg 0.00315 M♃ |
86164.223.935 h0.997 da |
| Mars | 2066200000001.381 AU206,620,000 km 128,387,715.74 mi |
2492300000001.666 AU249,230,000 km 154,864,342.241 mi |
0.09350.0935 | 686.981.881 a686.98 da | 0.0322885911618951.85 °0.0323 rad 2.056 grad |
6.4185E+230.107 M⊕6.4185e+23 kg 3.38047e-4 M♃ |
88642.4424.623 h1.026 da |
References
- The Terrestrial Planets by Paul J. Marquard
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See Also
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