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Cecilia Helena Payne-Gaposchkin

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Payne-Gaposchkin, Cecilia Helena (1900-1979) was a British-born astronomer who became an authority on variable stars (stars that change in brightness) and the structure of the Milky Way Galaxy.

Polaris Star: How to Spot the North Star in the Night Sky

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Polaris, also known as the North Star, is almost exactly over the celestial North Pole, making it extremely useful for navigation (and for making wishes on, as well).

The Milky Way: Understanding Our Place in the Galaxy

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A look at the night sky at any time of year will reveal a faint band of light stretching across the sky -- our solar system's home, the Milky Way. How much do we really know about it?

Just How Many Galaxies Are in the Universe?

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Galaxies are large systems of stars, gas, dust and dark matter that orbits a center and is bound by gravity. Learn about the characteristics of galaxies.

How the Big Bang Theory Works

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The big bang theory is well-known, but there are many misconceptions about it. Like what? Let's start with this one: There was no bang.

How Telescopes Work

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For centuries, curious observers have probed the heavens with the aid of telescopes. Today, both amateur and professional scopes magnify images in a variety of ways.

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