astronomer - Scientist who studies the stars and sky, artifact - Something scientists find and try to figure out, solar - Think of the sun, system - We live in a solar..., nighttime - We go to bed at this time, daytime - We wake up at this time, observe - What we do when we look at something closely, model - A way to show something , distance - The sun is very far! What do you use to measure this? , pegasus - A constellation,

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