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Greenfield-Astrono#2

Astronomy#2

TermDefinition
Moon a natural satellite that revolves around a planet.
Heliocentric The current theory of the organization of the universe; states that the Earth is part of a solar system that revolves around the sun.
Jupiter The largest planet in our solar system; has a giant hurricane system or storm which is the size the size of Earth.
Galileo The astronomer who used the telescope to make discoveries that supported the heliocentric model of the solar system.
Mars this terrestrial planet is called the "Red Planet''and is to believed to have once had water
Ring The gas giants all have at least one of these, which is a disk of small particls of ice and rock
Mercury This small terrestrial planet has almost no atmosphere and was first explored by the Mariner 10
Revolution The movement of one object around another; also referred to as a planet's orbit
Gas Giants Jupiter, Saturn, Uranus, and Neptune are said to be _____ ______ because of their size
Ptolemy The Greek astronomer who first explained the geocentric model of the universe
Tychobrahe This astronomer first discovered the positions of the planets in our solar system
Elliptical The shape of the planets' orbits; an oval shape
Copernicus This astronomer was the first to develop the heliocentric model of the solar system
Galaxy We live in only one of many millions of these , which when combined , make up our universe
Terrestrial Mercury, Venus, Earth, and Mars are said to be __________ planets because they are made of rock.
Geocentric This theory states that Earth is at the center of the universe and other planets revolve around it
Rotation The spinning of Earth on its axis
Venus This terrestrial planet has a thick, poisonous atmosphere and is often referred to as "Earth's twin"
Eight There are __________ planets in our solar system
Pluto This is now classified as a "Dwarf Planet"
Neptune A cold blue planet in our solar system
Kepler This astronomer was Brahe's assistant and used information they gathered to study the planets' orbits and determined they were in the shape of an ellipse or eliptical
Saturn The gas giant with the most complex ring system
Sun The star at the center of our solar system
Uranus This gas giant's axis is tilted causing it to spin on its side
Created by: pattigreenfield
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