inner planets


Also found in: Dictionary.

inner planets

The terrestrial planets Mercury, Venus, Earth, and Mars, which lie closer to the Sun than the main asteroid belt.
References in periodicals archive ?
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.
While researchers are still not sure exactly what it is, the layer supports the theory that organic compounds and water were transferred from the outer solar system to the inner planets, ultimately leading to life on Earth.
Mercury is the last of the rocky inner planets in our solar system -- also counting Mars and Venus -- to be littered by mankind.
That the four inner planets are relatively small and rocky, while the outer planets are primarily gas-giants.
Scientists think it was too hot in the solar system's early days for water to condense into liquid or ice on the inner planets, so it had to be delivered -- possibly by comets and water-bearing asteroids.
"This work is a great step towards tying together our understanding of the orbits of the outer planets of our solar system and those of the inner planets," said Dayton Jones of Jet Propulsion Laboratory in Pasadena, California.
He covers the origin of the Solar System, planets and their orbits, planetary differentiation, magnetic fields, planetary atmospheres, the geological development of the inner planets, volcanism within the inner Solar System, Earth's moon, the outer planets, moons of Jupiter and Saturn, and moons of Uranus and Neptune.
These four inner planets all measure less than 1.5 times the size of Earth.
This showed that the dwarfs were "polluted" with silicon - the element found in the rocky material that makes up the Earth, the other inner planets in our Solar System, and its asteroids.
AFP/Washington Scientists have announced new evidence that Mercury, the planet orbiting nearest the Sun, hosts massive caches of ice and revealed new information on how water reached our solar system's 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."