- The word telescope comes from the Greek words tele meaning far and skope meaning to look or see.
- The spectroscope was one of the first tools used in the study of space. This instrument helped us to learn that the universe is continuously expanding.
- Most comets come from the Oort cloud, a ring of debris around the solar system.
- The Oort cloud is an extended shell of icy objects that exist in the outermost reaches of the solar system.

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