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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).
"Chicago of the South" "Convention City of Dixie Land" An 1859 industrial journal was among the first to note nicknames for Atlanta, Georgia: [1]. An orator claimed for it the signification of "a city among the hills" while a writer has declared that it was the opposite of "rus in urbe" ("country in the city") and proclaimed it "'the city in the woods".
This is an accepted version of this page This is the latest accepted revision, reviewed on 22 February 2025. Hypothetical group of multiple universes Not to be confused with Metaverse. "Multiverses" redirects here. Not to be confused with MultiVersus. For other uses, see Multiverse (disambiguation). Part of a series on Physical cosmology Big Bang · Universe Age of the universe Chronology of ...
Pluto's reign. For decades, students learned the phrase "My Very Educated Mother Just Served Us Nine Pizzas" to remember the order of the planets in the solar system: Mercury, Venus, Earth, Mars ...
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.
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Starburst galaxies were more common during the universe's early history, [112] but still contribute an estimated 15% to total star production. [ 113 ] Starburst galaxies are characterized by dusty concentrations of gas and the appearance of newly formed stars, including massive stars that ionize the surrounding clouds to create H II regions ...