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Bright Side was created on 15 March 2017, and posts videos that are a mix of "facts", riddles and life hacks. [5] Bright Side has been described as a "popular content farm channel". [6] In June 2019, Bright Side popularized a 382-day fast held in 1965 by Angus Barbieri, after creating an animated video recounting the event. The video received ...
Before going live on YouTube, the family replaced their real-life surname with the on-screen surname Kaji. [14] [15] [16] In 2017, Kaji's parents signed a deal with PocketWatch, a startup children's media company that was founded in 2016 by Chris Williams and Albie Hecht. PocketWatch does the marketing and merchandise for Ryan's YouTube ...
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.
The Cosmic Calendar is a method to visualize the chronology of the universe, scaling its currently understood age of 13.8 billion years to a single year in order to help intuit it for pedagogical purposes in science education or popular science.
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.
The observable universe contains an estimated 10 22 to 10 24 stars. Only about 4,000 of these stars are visible to the naked eye—all within the Milky Way galaxy. [2] A star's life begins with the gravitational collapse of a gaseous nebula of material largely comprising hydrogen, helium, and trace heavier elements.
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A "closed universe" is necessarily a closed manifold. An "open universe" can be either a closed or open manifold. For example, in the Friedmann–Lemaître–Robertson–Walker (FLRW) model, the universe is considered to be without boundaries, in which case "compact universe" could describe a universe that is a closed manifold.