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Science: Week #8 Earth & Space Science

Across
Huge, colorful clouds of gas and dust in outer space
The effect that makes something look as if it has moved when you look at it with one eye and then the other
Devices that convert the Sun's energy into electrical energy
The abbreviation for Global Positioning System
Down
A giant cluster of starts hundreds of light years across
The last name of the man who first proposed that the Earth revolves around the Sun
The path made by a celestial object as it moves around another object