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On the other hand, some scientists, theories and popular works conceive of a multiverse in which the universes are so similar that humanity exists in many equally real separate universes but with varying histories. [95] There is a debate about whether the other worlds are real in the many-worlds interpretation (MWI) of quantum mechanics.
Perhaps unsurprisingly, our universe has just the right mass–energy density, equivalent to about 5 protons per cubic meter, which has allowed it to expand for the last 13.8 billion years, giving time to form the universe as observed today. [65] [66] There are dynamical forces acting on the particles in the universe which affect the expansion ...
The observable universe contains as many as an estimated 2 trillion galaxies [36] [37] [38] and, overall, as many as an estimated 10 24 stars [39] [40] – more stars (and, potentially, Earth-like planets) than all the grains of beach sand on planet Earth.
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Named Earth-7642 in The Official Handbook of the Marvel Universe A-Z #3 [22] Superman vs. The Amazing Spider-Man (January 1976) Dreamworld: Post-Crisis: The Love Syndicate of Dreamworld (Sunshine Superman, the Speed Freak, and Magic Lantern) A world based on the drug culture that appeared briefly in Grant Morrison's Animal Man comic book series ...
Size (left) and distance (right) of a few well-known galaxies put to scale. There are an estimated 100 billion galaxies in all of the observable universe. [1] On the order of 100,000 galaxies make up the Local Supercluster, and about 51 galaxies are in the Local Group (see list of nearest galaxies for a complete list).
Scientists explored Beethoven’s ailments, linked remains to a Norse saga, uncovered colonial secrets, peeked inside an alchemy lab and debunked a royal hoax in 2024.
From the total of 5,086 stars known to have exoplanets (as of January 26, 2024), there are a total of 1,033 known multiplanetary systems, [1] or stars with at least two confirmed planets, beyond the Solar System. This list includes systems with at least three confirmed planets or two confirmed planets where additional candidates have been proposed.