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Physics & Astronomy Facts

Swimmer
Don't Make Waves

Fast and slow swimming pools? What are they? A given pool's walls and other components may create and reflect waves making it more difficult (slow) for athletes to swim. A fast pool minimizes wave int ...

The Fourth State of Matter

There are three classic states of matter: solid, liquid, and gas; however, plasma is considered by some scientists to be the fourth state of matter. The plasma state is not related to blood plasma, th ...
The brilliant stars seen in this image are members of the popular open star cluster known as the Pleiades, or Seven Sisters.
How Far Are The Seven Sisters?

The Pleiades cluster, named by the ancient Greeks, is easily seen as a small grouping of stars lying near the shoulder of Taurus, the Bull, in the winter sky. Although it might be expected that the di ...

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