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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 of inner planet
First recorded in 1950-55 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for inner planet
Historical Examples
  • The inner planet revolved about it with one side glowing low red heat and the other side piled high with frozen atmosphere.

    Talents, Incorporated William Fitzgerald Jenkins
British Dictionary definitions for inner planet

inner planet

any of the planets Mercury, Venus, earth, and Mars, whose orbits lie inside the asteroid belt
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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inner planet in Science
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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