Earth and the solar system

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Gravity

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The force that attracts a body towards the center of the earth, or towards any other physical body having mass.

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Orbit

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The curved path of a celestial object or spacecraft around a star, planet, or moon.

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Solar System

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The collection of eight planets and their moons in orbit around the sun, along with smaller bodies like asteroids, meteoroids, and comets.

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Comet

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A celestial object consisting of a nucleus of ice and dust. When it is near the sun, a 'tail' of gas and dust particles is visible pointing away from the sun.

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Core

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The central or most important part of something, in astronomy, it often refers to the central region of a planet or star.

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Dwarf Planet

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A celestial body that resembles a small planet but lacks certain technical criteria necessary to be classified as such.

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Asteroid

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A small rocky body that orbits the sun, found mainly between the orbits of Mars and Jupiter in the asteroid belt.

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Astronomer

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A scientist who studies celestial bodies such as planets, stars, and galaxies.

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Atmosphere

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The layer of gases surrounding the earth or another planet.

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Spaceship

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A vehicle or device designed to travel or operate in outer space.