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

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, "Legacy of Lunar Data: How Apollo Revealed our Moon," 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, "This weekend, China embarks on a historic mission to land on the far side of the Moon," 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, "How Jupiter May Have Gifted Early Earth With Water," 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, "May the 4th be with Earth, a perfect planet that’s not too Hoth or Tatooine," 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, "Looking for Planet Nine, Astronomers Gaze into the Abyss," 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, "Legacy of Lunar Data: How Apollo Revealed our Moon," 20 May 2019 In July, Batygin, Brown and Elizabeth Bailey showed that Planet Nine’s presence could also exactly account for the 6-degree tilt of the sun with respect to the plane of the inner planets — a 150-year-old mystery. Quanta Magazine, "Planet Nine Is Put on Trial in Absentia," 27 June 2017 The standard model is humanity's own system: The inner planets are rocky and solid, outer planets are gaseous. David Grossman, Popular Mechanics, "Mysterious Iron Exoplanet Could Reveal the Secrets of Our Own Solar System," 5 Feb. 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.

See More

First Known Use of inner planet

1951, in the meaning defined above

Keep scrolling for more

Learn More about inner planet

Statistics for inner planet

Last Updated

24 Aug 2019

Look-up Popularity

Time Traveler for inner planet

The first known use of inner planet was in 1951

See more words from the same year

Comments on inner planet

What made you want to look up inner planet? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

to fake an opponent out of position

Get Word of the Day daily email!

Test Your Vocabulary

Where in the World? A Quiz

  • peter bruegel tower of babel painting
  • What language does pajama come from?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Citation

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!