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Science: Week #4 Crossword Puzzle

Across
Scientists who study space
Is the distance that light can travel in one year
Carries more energy than visible light, and exposed to it will give you a sunburn
A set of connected parts that work together
Down
If you find this, then it will always tell you which way is north
A group of stars that form a pattern
Process that combines aotms and releases energy
Large group of stars, planets, gas, and dust stuck together by gravity