terrestrial planets


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terrestrial planets

The planets Mercury, Venus, Earth, and Mars. They are small rocky worlds with shallow atmospheres in comparison with the mainly gaseous giant planets.
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Also known as ocean planets, water worlds are within the realm of terrestrial planets but they are covered in water, as their name implies.
Differentiation into a core, mantle, and crust, and evidence for interior volcanic processes, are typical hallmarks of a terrestrial planet.
The four "inner planets," or terrestrial planets, are made up of rock.
He added: "These water-rich building blocks, and the terrestrial planets they build, may in fact be common - a system cannot create things as big as asteroids and avoid building planets, and GD 61 had the ingredients to deliver lots of water to their surfaces.
The topics include the Sun and other stars, the terrestrial planets, the Moon, asteroids, comets and the Kuiper Belt, and theories of the origin and evolution of the Solar System.
Our understanding is that this kind of meteorite is the starting composition of the terrestrial planets, from Mercury to the Earth.
From telescopic studies, we knew this Arizona-sized world had an interesting shape and composition, and that it's a possible example of the building blocks from which all the terrestrial planets formed 4.
They also show how this theory can be applied to analyzing the super-rotation of slowly rotating terrestrial planets and major moons, and the key large-scale features of the gas giants in the solar system.
Team member Dr Paul Butler, from the Carnegie Institution of Washington, said: "This is the smallest extrasolar planet yet detected and the first of a new class of rocky terrestrial planets.
Susan Terebey, of the Extra-solar Research Corporation in California, whose team made the Hubble discovery, said: "This will not directly tell us about any possible terrestrial planets like Earth.
Even though the planets in the outer solar system are much larger, their distance from the sun would make Jupiter, Saturn, Uranus and Neptune more difficult to spot than the terrestrial planets in the inner solar system: Mercury, Venus, our Earth and Mars.

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