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  2. 135 Interesting Facts for Kids and Adults to Blow Your Mind - AOL

    www.aol.com/135-interesting-facts-kids-adults...

    Interesting Facts for Kids. 66. Scotland's national animal is a unicorn. 67. Tigers have striped skin, not just striped fur. ... There are more stars in the universe than there are grains of sand ...

  3. George's Secret Key to the Universe - Wikipedia

    en.wikipedia.org/wiki/George's_Secret_Key_to_the...

    George's Secret Key to the Universe is a 2007 children's book written by Lucy and Stephen Hawking with Christophe Galfard.Upon its release, the book received mixed reviews, and was followed by five sequels, George's Cosmic Treasure Hunt in 2009, George and the Big Bang in 2011, George and the Unbreakable Code in 2014 and George and the Blue Moon in 2016 and George and the Ship of Time [] in 2018.

  4. George and the Big Bang - Wikipedia

    en.wikipedia.org/wiki/George_and_the_Big_Bang

    The bomb was disarmed. Then, two people walked forward and asked why there were two children in the LHC. George and Annie explained themselves and Dr. Ling was surprised to see the bomb was in the drinks machine. Then,Eric says that ATLAS can run a show of the universe backwards all the way back to 13.7 billion years ago. Meanwhile, Vincent put ...

  5. Outer space - Wikipedia

    en.wikipedia.org/wiki/Outer_space

    According to the Big Bang theory, the very early universe was an extremely hot and dense state about 13.8 billion years ago [21] which rapidly expanded. About 380,000 years later the universe had cooled sufficiently to allow protons and electrons to combine and form hydrogen—the so-called recombination epoch.

  6. List of unsolved problems in astronomy - Wikipedia

    en.wikipedia.org/wiki/List_of_unsolved_problems...

    Origin and fate of the universe: How did the conditions for anything to exist arise? Is there potentially an infinite amount of unknown astronomical phenomena throughout our entire universe? Is the universe heading toward a Big Freeze, a Big Rip, a Big Crunch, or a Big Bounce, or is it part of an infinitely recurring cyclic model? Multiverse:

  7. Universe - Wikipedia

    en.wikipedia.org/wiki/Universe

    The physical universe is defined as all of space and time [a] (collectively referred to as spacetime) and their contents. [10] Such contents comprise all of energy in its various forms, including electromagnetic radiation and matter, and therefore planets, moons, stars, galaxies, and the contents of intergalactic space.

  8. Astronomy - Wikipedia

    en.wikipedia.org/wiki/Astronomy

    With this Hubble formulated the Hubble constant, which allowed for the first time a calculation of the age of the Universe and size of the Observable Universe, which became increasingly precise with better meassurements, starting at 2 billion years and 280 million light-years, until 2006 when data of the Hubble Space Telescope allowed a very ...

  9. 13 Surprising Earth Day Facts That Most People Don't Know - AOL

    www.aol.com/13-surprising-earth-day-facts...

    Here, learn surprising Earth Day facts. Earth Day has been around since the '70s. Every year, over a billion people get involved with the initiatives. Here, learn surprising Earth Day facts.