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Astronomy grade 6

Across
Comets are made of ice, dust, and ____.
Closest to the sun, hot days and cold nights, no atmosphere , no moon
The Milky Way is a ____ galaxy.
Orbits around
A small rock in space
Located between Mars and Jupiter
Largest ring system, rings are made of ice
Hubble observed that he universe must be _________ from the Big Bang Theory.
Only planet that has life
The lengths of days and nights are equal at the __________.
Red planet, largest volcano in solar system
Hottest planet, hot because of greenhouse effect
Down
Man who provided proff that the sun is the center of the solar system
Wrote a book about how Earth was the center of the universe
Believed the earth was the center of the solar system
Aristotle believed that when two objects dropped, the heavier one would drop ____.
Turns and twists
First person to state that the sun is the center of the solar system
Discovered that the universe is expanding.
The two things that determine strength of gravity between two objects are ____ and distance.
Coldest planet, spins on its side
Furthest from the sun, blue because of methane in earth's atmosphere
Why we have seasons