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  1. nasa.gov
    https://science.nasa.gov/universe

    Universe - NASA Science

  2. nasa.gov
    https://science.nasa.gov/exoplanets/what-is-the-universe

    What is the Universe? - NASA Science

  3. britannica.com
    https://www.britannica.com/science/universe

    Universe | Definition & Facts | Britannica

  4. wikipedia.org
    https://en.m.wikipedia.org/wiki/Universe

    Universe - Wikipedia

  5. nasa.gov
    https://science.nasa.gov/gallery/universe-images

    Universe Images - NASA Science

  6. livescience.com
    https://www.livescience.com/what-is-the-universe

    What is the universe? - Live Science

  7. nasa.gov
    https://plus.nasa.gov/topics/the-universe

    The Universe - NASA+

  8. nasa.gov
    https://spaceplace.nasa.gov/menu/space

    Universe | NASA Space Place – NASA Science for Kids

  9. nasa.gov
    https://www.nasa.gov/science-research/astrophysics/origin...

    Origin & Evolution of the Universe - NASA

  10. nasa.gov
    https://imagine.gsfc.nasa.gov/science

    Science - Imagine the Universe!