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  1. Dictionary
    Big Bang
    /ˌbɪɡ ˈbaŋ/

    noun

    • 1. the rapid expansion of matter from a state of extremely high density and temperature which according to current cosmological theories marked the origin of the universe.
    • 2. (in the UK) the introduction in 1986 of major changes in trading on the Stock Exchange, principally involving widening of membership, relaxation of rules for brokers, and computerization.

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  2. spaceplace.nasa.gov › big-bang › enWhat Is the Big Bang? | NASA Space Place – NASA Science for Kids

    Nov 8, 2024 · The Short Answer: The big bang is how astronomers explain the way the universe began. It is the idea that the universe began as just a single point, then expanded and stretched to grow as large as it is right now—and it is still stretching!

  3. spaceplace.nasa.gov › menu › solarsystemBig Bang | NASA Space Place – NASA Science for Kids

    Nov 8, 2024 · NASA science games, articles and activities for kids

  4. spaceplace.nasa.gov › menu › spaceUniverse | NASA Space Place – NASA Science for Kids

    Nov 8, 2024 · What Is the Big Bang? Why do we call it that? explore; Where Does Interstellar Space Begin? Interstellar space begins where the sun’s magnetic field stops affecting its surroundings. explore; What Is a Satellite Galaxy? What are they and what will become of them? explore; Build your own spacecraft! Become a NASA engineer! do; A Planet Without ...

  5. spaceplace.nasa.gov › james-webb-space-telescope › enWhat Is the James Webb Space Telescope? - NASA Space Place

    Nov 8, 2024 · The James Webb Space Telescope is the largest, most powerful space telescope ever built. It will allow scientists to look at what our universe was like about 200 million years after the Big Bang. The telescope will be able to capture images of some of the first galaxies ever formed.

  6. spaceplace.nasa.gov › light-year › enWhat Is a Light-Year? | NASA Space Place – NASA Science for Kids

    Nov 8, 2024 · It is 13.4 billion light-years away, so today we can see it as it was 13.4 billion years ago. That is only 400 million years after the big bang. It is one of the first galaxies ever formed in the universe. Learning about the very first galaxies that formed after the big bang, like this one, helps us understand what the early universe was like.

  7. spaceplace.nasa.gov › dark-matterWhat Is Dark Matter? | NASA Space Place – NASA Science for Kids

    Nov 8, 2024 · For the first 150 million years after the Big Bang, there were no galaxies or stars or planets. The universe was just a soup of tiny, tiny things called particles. Gravity, the force that pulls you to the Earth and attracts all matter together, began to pull these particles toward each other.

  8. spaceplace.nasa.gov › galaxy › enWhat Is a Galaxy? | NASA Space Place – NASA Science for Kids

    Nov 8, 2024 · A galaxy is a huge collection of gas, dust, and billions of stars and their solar systems. A galaxy is held together by gravity. Our galaxy, the Milky Way, also has a supermassive black hole in the middle. When you look up at stars in the night sky, you’re seeing other stars in the Milky Way.

  9. spaceplace.nasa.gov › menu › universeUniverse | NASA Space Place – NASA Science for Kids

    Nov 8, 2024 · What Is the Big Bang? Why do we call it that? explore; Make Stretchy Universe Slime! Make the universe stretch and expand! do; What Is Dark Matter? and dark energy, too! explore

  10. spaceplace.nasa.gov › hubble › enThe Amazing Hubble Telescope - NASA Space Place

    Sep 27, 2023 · This led to the “Big Bang” theory, which says that the universe began with an intense burst of energy and has been expanding ever since. Edwin Hubble seated at the 100-inch reflecting telescope at the Mount Wilson Observatory in California.

  11. spaceplace.nasa.gov › search › spaceUniverse | NASA Space Place – NASA Science for Kids

    Nov 8, 2024 · Everything! The James Webb Space Telescope is the largest, most powerful space telescope ever built. Interstellar space begins where the sun’s magnetic field stops affecting its surroundings. Resources to help you spread the word about NASA Space Place! This type of weather comes from activity on the Sun’s surface.