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4th Solar System

galaxy A galaxy is a large group of stars, dust, gas and dark matter held together by gravity
Composition what something is made of, its parts
constellation a group of stars that make an imaginary shape in the night sky
Ursa Major a north polar constellation and the third largest constellation in the sky
Ursa Minor the group of stars in the northern sky that includes the stars that form the Little Dipper
Dipper A cluster of seven stars in the constellation Ursa Major, four forming the bowl and three the handle of a dipper-shape
Orion a constellation on the equator east of Taurus; contains Betelgeuse and Rigel
Astronomy the study of the Universe and the changes that take place in and around all objects moving through space
telescope a device shaped like a long tube that you look through in order to see things that are far away
Astrolabe a device that measures the distance from a star to the horizon
compass A magnetic compasscontains a magnetized needle that swings on a pin to point north
sextant a device that measures the angles between stars
rotation a turning around as on an axis
ocean tide the rising and falling of the sea due to the pull of gravity from the sun and moon
axis a real or imaginary line on which something rotates
shadow A dark area or shape made by an object blocking rays of light
tilt pitching dangerously to one side
Revolution the movement of one object around a center or another object
Popular Earth Science sets




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