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Participation and representation of humanity in space is an issue of human access to and presence in space ever since the beginning of spaceflight. [16] Different space agencies , space programs and interest groups such as the International Astronomical Union have been formed supporting or producing humanity's or a particular human presence in ...
Intergalactic space takes up most of the volume of the universe, but even galaxies and star systems consist almost entirely of empty space. Most of the remaining mass-energy in the observable universe is made up of an unknown form, dubbed dark matter and dark energy. Outer space does not begin at a definite altitude above Earth's surface.
The universe is home to real-life Death Stars that could destroy Earth. The latest science reveals the terrifying secrets of NASA 's six deadliest: Cataclysmic variable stars , supernovas that can vaporize a planet , and unpredictable intergalactic stars .
For hundreds of a millions of years, the universe existed in the dark ages—an epoch when only primordial gasses existed. Then, a period of reionization, cleared away this foggy existence an ...
Synonyms are also found in Latin authors (totum, mundus, natura) [36] and survive in modern languages, e.g., the German words Das All, Weltall, and Natur for universe. The same synonyms are found in English, such as everything (as in the theory of everything), the cosmos (as in cosmology), the world (as in the many-worlds interpretation), and ...
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.
Scientists say they've discovered a new galaxy that's so dark and compact, it's basically invisible. But it's actually been here the whole time.
The Rare Earth hypothesis argues that the evolution of biological complexity anywhere in the universe requires the coincidence of a large number of fortuitous circumstances, including, among others, a galactic habitable zone; a central star and planetary system having the requisite character (i.e. a circumstellar habitable zone); a terrestrial ...