Tevatron
The four-mile-long Tevatron with its superconducting magnets is the most powerful particle accelerator in the world. Traveling at almost the speed of light, protons and antiprotons circle the Tevatron in opposite directions. Physicists make the beams collide at the centers of two 5,000-ton detectors inside the Tevatron tunnel, revealing the conditions of matter in the early universe and its structure at the smallest scale.

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