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27 Cards in this Set

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  • Back
Star
A large, luminous ball of gas that is held together by its own gravity.
Universe
All that exists.
Galaxy
One of the vast numbers of systems containing stars, nebulae, star clusters and space debris that make up the universe.
Milky Way
our galaxy
Light Year
the distance light travels in a vacuum in one year, approximately 5.88 trillion miles
satellite
A man made object or vehicle made to orbit the earth; a celestial body orbiting another of larger size
solar system
the sun and everything that orbits around the sun
orbit
The path taken by a body in space as it moves around its center of attraction.
revolution
a complete turn around an axis or point.
circle of illumination
the zone of transition between light and dark around a sphere
centrifugal force
the force that pushes objects in a curved motion away from the center of the curve
axis
an imaginary pole that passes through the earth, connecting the North and South Poles
terrestrial planets
planets composed of rock material similar to Earth's.

Mercury, Venus, Earth, and Mars
Jovian planets
planets composed of frozen gases.

Jupiter, Saturn, Uranus and Neptune
asteriod
a celestial body that is a few feet to several hundred miles across and has a distinct orbit
continent
one of the seven principle land masses on earth
island
any land mass smaller than a continent that is completely surrounded by water
cardinal directions
the four primary directions

North, South, East, and West
intermediate directions
the four directions that fall between the primary directions:

Northeast, Southeast, Southeast and Northwest
compass rose
a diagram that show the directions in relation to eath other
relative location
where something is in relation to another object
plates
huge rigid slabs of crust
compass
an instrument with a magnetic needle that spins to align itself with the earth's magnetic poles
ocean
the body of salt water that covers over 70% of the earth's surface and is divided into five primary oceans
sea
a body of water smaller than an ocean
salinity
amount of salt contained in a solution
oceanographer
one who studies the oceans