inner planet


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inner planet

inner planet

n
(Celestial Objects) any of the planets Mercury, Venus, earth, and Mars, whose orbits lie inside the asteroid belt

in′ner plan′et


n.
any of the four planets closest to the sun: Mercury, Venus, Earth, or Mars.
[1950–55]
References in classic literature ?
As these catastrophes occur, the sun will blaze with renewed energy; and it may be that some inner planet had suffered this fate.
When an inner planet is at the greatest apparent distance from the Sun, it is said to be at greatest elongation.
The inner planet, Kepler-47b, orbits the pair of stars in less than 50 days.
Inner planet missions like this one can now be done for about the cost of a private jet or mega-yacht," he said.
The larger outer planet falls just outside the outer boundary of the habitable zone and is also likely to be rocky, while the smaller inner planet is too close to the star to be habitable.
INNER PLANET Mercury is not as uninteresting as we first thought
The inner planet, Kepler-47b, is three times wider than Earth and whips around the stars every 49 days.
An inner planet, PH3b, may have a rocky composition, like Earth.
The inner planet is estimated to have be either slightly less massive than Jupiter, while the outer one may be up to 10 times as massive as the gas giant - an estimate that is in line with other optical and infrared studies of the star system.
The smaller inner planet, Kepler-36b, is rocky and subject to quakes and volcanic eruptions caused by the interplay of the planets' gravitational forces on each other.
The inner planet, possibly a rocky one about three times the size of Earth, whizzes around the host stars roughly every 50 days.
What's more, the two planets have migrated into orbits that have a special gravitational synchrony--every time the outer planet makes one lap around Kepler-9, the inner planet makes two, Holman and his collaborators report online August 26 in Science.