Word of the Day: Perigee

The moon doesn’t orbit the Earth in a circle. It’s actually a squashed, football shape called an ellipse, and the Earth is off center. This means that the…

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Word of the Day: Corona

The corona is the outermost shell of the Sun’s atmosphere, made of plasma. It is somewhat mysterious in that it’s temperature is hotter than the sun’s surface, but…

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Word of the Day: Umbra

The umbra is the darkest part of the shadow cast by the moon onto the Earth during a solar eclipse. The penumbra is the lighter part of the…

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Word of the Day: Syzygy

Syzygy is a type of alignment of three celestial bodies in space. When three bodies, such as the Sun, the Moon, and Earth, are in szygy, it means…

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Word of the Day: Solar Eclipse

To match your excitement about the upcoming August 21, 2017 total solar eclipse, we are featuring a whole week of eclipse words! The first, obviously, is going to…

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Word of the Day: Axenic

In nature, bacteria grow in communities. However, scientists may want to grow only a single species of bacteria in the lab in order to study it. When a…

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