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 ?
Being an inner planet, Mercury can pass directly between the Earth and the Sun, an event known as a transit.
Intriguingly, notes Fischer, the ratio of the masses of the outer planet to the inner planet is the same as the ratio of Saturn's mass to Jupiter's.
As Jupiter moved inward, however, gravitational perturbations from the giant planet would have swept the inner planets (and smaller planetesimals and asteroids) into close-knit, overlapping orbits, setting off a series of collisions that smashed all the nascent planets into pieces.
But it may be just the ticket for flinging asteroids at the inner planets.
Among the topics are national and international programs in planetary science, priority questions, the inner planets as a key to understanding Earth-like worlds, the active worlds and extreme environments of satellites, recommended flight investigations, and the role of technology development in planetary exploration.
By measuring the sizes and masses of the five inner planets, we determined they are among the lowest mass confirmed planets beyond our solar system.
7, 8, 9 and 10 are the Houses, that the inner planets are occupying in your chart now.
Rather than presenting another general survey of the inner planets for high school students, undergraduates, and the interested public, Grier (Planetary Science Institute, Tucson, Arizona) and Rivkin (Johns Hopkins U.
But that underestimates the impact they have when they link with the inner planets.
Create a leaflet to help the local community learn the difference between the inner planets and the gas giants.
5 billion years from now, the sun will finally exhaust the source of hydrogen fuel in its core and swell monstrously to become a red giant, whose fiery surface will engulf our Earth and the inner planets.