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Solar System

*7.9ABC The Solar System

TermDefinition
Planet An object that orbits the Sun, has become rounded by its own gravity, and has cleared the area of its orbit
Asteroid A small, mostly rocky or metallic body that orbits the Sun in the inner solar system
Meteor A meteoroid that enters Earth's atmosphere in a streak of light
Kuiper belt A region beyond Neptune's orbit extending 30 to 50 AU from the Sun
Comet A loose ball of ice and rock that usually has a long, narrow orbit around the Sun
Oort Cloud The most distant part of our solar system
Solar System The Sun, the planets, and a variety of other objects
Sun an average-sized star, composed of helium and hydrogen, at the center of the solar system
Orbit to travel in a curved path around something
Astronomical Unit A unit of distance equal to the mean distance from the Sun to the Earth, or about 150,000,000 km
Moon A natural object, or satellite, that orbits a planet
Dwarf Planet an object that orbits the Sun and has enough gravity to be round but has not cleared the area of its orbit
Composition What makes up an object or a material
Inertia The tendency of an object in motion to resist a change in motion unless acted upon by a force
Habitable Zone an area around a star where it is neither too hot nor too cold for liquid water to exist on the surface of the planets within the area
Gravity the force that pulls things toward each other.
Habitability How livable a place, such as a planet, is
Sustainability Using resources in a way that humans do not run out of them, so they can continue to be used in the future
Atmosphere The layer of gasses that surrounds a planet.
Revolve/Revolution To move in a curved path round a center or axis.
Terrestrial (Inner) Rocky Planets One of the four inner planets of the solar system: Mercury, Venus, Earth, and Mars.
Jovian (Outer) Gaseous Planets One of the four outer planets of the solar system: Jupiter, Saturn, Uranus, and Neptune.
Water Odorless and tasteless liquid; comes from clouds as rain, forms streams, lakes, and seas, and is a major constituent of all living matter; freezes at 0°C, boils at 100°C, and is a conductor of electricity and a good solvent.
Essential Factors of Life on Earth 1. Right distance from the Sun. 2. Protected by magnetic field from solar radiation. 3. Kept warm by an insulating atmosphere. 4. Accessible liquid water. 5. Has the right chemical ingredients for life.
Elliptical Orbit Path followed by a satellite and shaped like an ellipse (oval), characterized by two focal points.
Force Cause of motion or change; push or pull.
Gravitational Attraction Force that attracts any two objects with mass.
Celestial Body Naturally occurring physical structures in the universe, including stars, planets, moons, asteroids, and galaxies.
Created by: trauberk
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