inner planet


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inner planet

[¦in·ər ′plan·ət]
(astronomy)
Any of the four planets (Mercury, Venus, Earth, and Mars) in the solar system whose orbits are closest to the sun.
References in periodicals archive ?
The inner planets, Mercury and Venus, go through a complete cycle of phases like the Moon.
Kepler detected the planets while monitoring light from this Sun-like star, catching 18 transits of the inner planet and 3 transits of the outer world.
It's no accident that these hypotheses represent more extreme versions of the inner planets in our solar system, because they're the only things we know.
Simulations show that outer planets with such a trajectory are conducive to the survival of inner planets that could harbor life.
Asteroids (minor planets in the inner solar system) are the bits and pieces left over after the formation of the inner planets, including the Earth.
During early planning the European Space Agency (ESA) determined that BepiColombo would require electric propulsion, a first for a mission visiting one of the Solar System's inner planets. Following QinetiQ's successful development of the T5 ion thruster for ESA's GOCE (Gravity field and steady-state Ocean Circulation Explorer) satellite, which orbited Earth for 4 years, ESA selected the larger T6 thruster for BepiColombo.
Caption: Bob made a sphere-cutting tool for his lathe so he could make the inner planets himself.
The astronomers studied levels of UV radiation emitted by Trappist-1 which suggest its inner planets could have lost 20 times more water in the last eight billion years than all the Earth's oceans combined.
Expanding outwards into the solar system, it will consume most of the inner planets (including the Earth).
Jupiter may have swept through the early solar system like a wrecking ball, destroying a first generation of inner planets before retreating into its current orbit, according to a study from the University of California, Santa Cruz.