inner planet

inner planet

noun Astronomy.
any of the four planets closest to the sun: Mercury, Venus, Earth, or Mars.
Also called terrestrial planet.
Compare outer planet.


Origin:
1950–55

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
inner planet
 
n
any of the planets Mercury, Venus, earth, and Mars, whose orbits lie inside the asteroid belt

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Science Dictionary
inner planet  
Any of the four planets Mercury, Venus, Earth, and Mars, whose orbits lie nearest the Sun. The inner planets are of similar size and have high densities compared to the larger gas giants among the outer planets. They are composed mostly of rock and metal and are relatively slow to rotate, with solid surfaces, no rings, and few moons. Also called terrestrial planet. Compare outer planet. See also inferior planet.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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