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  • Universe | Definition Facts | Britannica
    universe, the whole cosmic system of matter and energy of which Earth, and therefore the human race, is a part Humanity has traveled a long road since societies imagined Earth, the Sun, and the Moon as the main objects of creation, with the rest of the universe being formed almost as an afterthought
  • Earth | Definition, Size, Composition, Temperature, Mass, Facts . . .
    Earth, third planet from the Sun and the fifth largest planet in the solar system in terms of size and mass Its single most outstanding feature is that its near-surface environments are the only places in the universe known to harbor life Learn more about development and composition of Earth in this article
  • Observable universe | Definition, Size, Description, Facts | Britannica
    Observable universe, the region of space that humans can actually or theoretically observe with the aid of technology The observable universe, which can be thought of as a bubble with Earth at its centre, is differentiated from the entirety of the universe, which is the whole cosmic system of
  • universe - Kids | Britannica Kids | Homework Help
    The universe is everything that exists, including objects and energy, throughout time and space Earth, the Sun, and the rest of the solar system are only a very small part…
  • Geocentric model | Definition, History, Facts | Britannica
    Geocentric model, any theory of the structure of the solar system (or the universe) in which Earth is assumed to be at the center of it all The most highly developed geocentric model was that of Ptolemy of Alexandria (2nd century CE) It was generally accepted until the 16th century
  • solar system - Kids | Britannica Kids | Homework Help
    The solar system consists of the Sun and everything that orbits, or travels around, the Sun This includes the eight planets and their moons, dwarf planets, and countless…
  • Universe Definition Meaning | Britannica Dictionary
    UNIVERSE meaning: 1 : 66754; 2 : 3 the universe : all of space and everything in it including stars, planets, galaxies, etc
  • Dark energy | Definition, Discoverers, Facts | Britannica
    Dark energy, repulsive force that is the dominant component of the universe
  • Star | Definition, Light, Names, Facts | Britannica
    Star, any massive self-luminous celestial body of gas that shines by radiation derived from its internal energy sources This article describes the properties and evolution of individual stars Included in the discussion are the sizes, energetics, temperatures, masses, and chemical compositions of stars
  • Redshift | Definition Facts | Britannica
    Redshift, displacement of the spectrum of an astronomical object toward longer (red) wavelengths It is attributed to the Doppler effect, a change in wavelength that results when an object and an observer are in motion with respect to each other Learn about redshift in this article





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