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planets
vocab
Astronomers
100
mercury
what is the closet planet to the sun
100
third planet from the sun
earth
100
discovered the three laws of motions
What is Issac Newton
200
9 planets
how many planets are in the solar system
200
distance light travels in one year
light year
200
created the first telescope
What is Hans Lippershey
300
Venus
What is the hottest planet in the solar system
300
a cloud of dust and gas
Nebula
300
believed that the earth is the center of the milky way galaxy
What is Tycho Brahe
400
harsh
What is the weather on Jupiter
400
ring shaped circumstellar disk
What is Debris dust
400
helped NASA with U.S. space mission to Venus, Mars, and Jupiter
Carl Sagan
500
Triton
what moon is the biggest on Neptune
500
light waves created by fluctuations of electric fields
What is electromagnetic radiation