inner planet

noun

: 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

Figuring out the moons' true origin story would provide key clues about Mars' geological past, the solar system's early history and the formation of the inner planets, mission team members have said. — Josh Dinner, Space.com, 19 Oct. 2026

This inner planet, being closer, will move more rapidly around the star than the outer planet. — Phil Plait, Scientific American, 16 Oct. 2026

This means that for every five orbits completed by the inner planet, the outer planet completes almost exactly three orbits. — Chris Young july 30, Refractor, 30 July 2026

Venus, like Mercury, is an inner planet to Earth, so it is often lost in the sun’s glare and can thus only ever be seen just before sunrise or after sunset. — Jamie Carter, Forbes.com, 16 Mar. 2026

Word History

First Known Use

1770, in the meaning defined above

Rhymes for inner planet

• pomegranate
• gannet
• granite
• intranet