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Deep-sky tour challenges for summer

Challenge yourself with these tough telescopic targets.
Cat's Eye Nebula (NGC 6543)About a third of the way from the head of Draco the Dragon to Polaris the North Star, lies the Cat's Eye Nebula (NGC 6543), a planetary nebula made famous by a colorful picture from the Hubble Space Telescope. Amateur telescopes show it as an irregular blue-green disk about the size of Saturn. NGC 6543's position in a relatively barren area makes it a bit tricky to find....

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