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“A telescope is a kind of time machine...If you see the Andromeda Galaxy in the night sky, you are looking two million years into the past. The light you see tonight left Andromeda two million years ago. The Andromeda Galaxy may not even be there now.”
― Ask a Science Teacher: 250 Answers to Questions You've Always Had About How Everyday Stuff Really Works
― Ask a Science Teacher: 250 Answers to Questions You've Always Had About How Everyday Stuff Really Works
