How Do We Find Dark Matter?

Physicists are on the hunt for dark matter, but how do they detect it?

Read More:
NASA Finds Direct Proof of Dark Matter
http://www.nasa.gov/centers/marshall/news/news/releases/2006/06-096.html
“Dark matter and normal matter have been wrenched apart by the tremendous collision of two large clusters of galaxies. The discovery, using NASA's Chandra X-ray Observatory and other telescopes, gives direct evidence for the existence of dark matter.”

What Is Dark Energy?
http://science.nasa.gov/astrophysics/focus-areas/what-is-dark-energy/
“More is unknown than is known. We know how much dark energy there is because we know how it affects the Universe's expansion.”
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