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Step outside and look up. This will depend on the light pollution conditions of your area, but even in cities on a clear night you can see a few stars and perhaps even a planet. Websites like Sky and Telescope offer tips on what’s in the sky every night.
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Online resources abound for finding constellations, planets, and even the International Space Station. There are also resources to help you find less light-polluted areas, if you have access to a car.
Read more about backyard astronomy here.