Dark Matter & Dark Energy - Science@NASA
https://science.nasa.gov/universe/dark-matter-dark-energy/
webDark Matter & Dark Energy. Discover the universe's building blocks – matter, dark matter, and dark energy. Overview. Everything scientists can observe in the universe, from people to planets, is made of matter. Matter is defined as any substance that has mass and occupies space. But there’s more to the universe than the matter we can see.
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