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Science Chapter 6

Satellite Is a body that orbits a planet.
Planet Is an object that orbits the sun, is a large enough to have become rounded by its own gravity, and cleared the area of its orbit.
Meteors Is a streak of light produced when a small object burns up entering Earth's atmosphere.
Comet Is a cold mixture of dust and ice that gives up a long trail of light as it approaches the sun.
Star Is a giant ball of hit gas, mainly composed to hydrogen and helium.
Constellation Is a pattern or group of stars that people imagined to represent a figure animal or object.
Axis The imaginary line that passes through Earth's center and the North and South poles.
Rotation The spinning of Earth on its axis.
Revolution Is the movement of one object around another.
Orbit Is a slightly elongated circle, or ellipse.
Calendar Is a system of organizing time that defines the beginning, length, and divisions of a year.
Solstice The sun appears farthest north of the equator once each year and farthest south once each year.
Equinox The noon sun is directly overhead at the equator, rises due east, and sets due west.
Gravity Attracts all objects toward each other.
Law of Universal Gravitation States that every object in the universe attracts every other object.
Mass Is the amount of matter in an object.
Weight The measure of the force of gravity on an object.
Interia The tendency of an object to resist a change in motion.
Newton's First Law of Motion Says that an object at rest will stay at rest and an object in motion will stay in motion with constant speed and direction unless acted on by a force.
Phases The different shapes of the moon you see from Earth. They are caused by the motions of moon around Earth.
Eclipse When an object in space comes between the sun and a third object, it casts a shadow on that object.
Solar Eclipse Occurs when the moon passes directly between Earth and the Sun, blocking sunlight from Earth.
Umbra The very darkest part of the moons shadow.
Penumbra The largest part of the shadow.
Lunar Eclipse Occurs at the full moon when Earth is directly between the moon and the sun.
Tides The rise and fall of ocean water that occurs every 12.5 hours or so.
Spring tide The combined forces produce a tide with the greatest difference between consecutive low and high tides.
Neap Tide The suns pull is at right angles to the moons pull.
Maria Are hardened rock formed from huge lava flows that occurred 3-4 billions year ago.
Craters Large round pits.
Meteroroids Chucks or rock or dust from space.
Force Is a push or a pull.
Created by: lytton_hadley