inner planet

noun

Definition of inner planet

: any of the planets Mercury, Venus, Earth, and Mars whose orbits are within the asteroid belt

Examples of inner planet in a Sentence

Recent Examples on the Web Earth, which is protected by a thick, but livable atmosphere enabled by our own internal energy source—the spinning dynamo of our molten iron core—is the only inner planet with adequate protection from the sun. Caroline Delbert, Popular Mechanics, 16 Oct. 2020 The instability also scattered oddball moons and asteroids and triggered smaller bodies to pummel the inner planets. Paul Voosen, Science | AAAS, 21 Jan. 2020 The lunar rocks ultimately tell us of a violent chapter in solar system history, when a period known as the Late Heavy Bombardment rained down space rocks, heavily scarring the inner planets. Korey Haynes, Discover Magazine, 20 May 2019 Many scientists think these holes occurred during a period of the Solar System known as the Late Heavy Bombardment — a period when a huge number of asteroids smacked into the inner planets. Loren Grush, The Verge, 6 Dec. 2018 Instead, all planetary systems fortunate enough to host a gas giant in their outskirts should automatically have water-rich material falling on their rocky inner planets. Nola Taylor Redd, Smithsonian, 20 June 2018 As our solar system formed, the early sun blasted the inner planets with radiation and high-speed plasma, which drove off most of the gases (hydrogen, water vapor and CO2). Scott Denning, Washington Post, 4 May 2018 Planet Nine’s gravitational influence could even serve as a solution to the long-standing mystery of why the sun’s axis of spin is tilted six degrees askew to the orbits of the inner planets. Lee Billings, Scientific American, 22 Mar. 2018 The lunar rocks ultimately tell us of a violent chapter in solar system history, when a period known as the Late Heavy Bombardment rained down space rocks, heavily scarring the inner planets. Korey Haynes, Discover Magazine, 20 May 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'inner planet.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of inner planet

1951, in the meaning defined above

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Time Traveler for inner planet

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The first known use of inner planet was in 1951

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Dictionary Entries Near inner planet

inner phase

inner planet

inner post

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Cite this Entry

“Inner planet.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/inner%20planet. Accessed 22 Oct. 2021.

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