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  2. Location of Earth - Wikipedia

    en.wikipedia.org/wiki/Location_of_Earth

    Because the observable universe is defined as that region of the Universe visible to terrestrial observers, Earth is, because of the constancy of the speed of light, the center of Earth's observable universe. Reference can be made to the Earth's position with respect to specific structures, which exist at various scales.

  3. Geocentric model - Wikipedia

    en.wikipedia.org/wiki/Geocentric_model

    Ptolemy argued that the Earth was a sphere in the center of the universe, from the simple observation that half the stars were above the horizon and half were below the horizon at any time (stars on rotating stellar sphere), and the assumption that the stars were all at some modest distance from the center of the universe. If the Earth were ...

  4. Geographical centre of Earth - Wikipedia

    en.wikipedia.org/wiki/Geographical_centre_of_Earth

    Geometrically defined it is the centroid of all land surfaces within the two dimensions of the Geoid surface which approximates the Earth's outer shape. The term centre of minimum distance [ 1 ] specifies the concept more precisely as the domain is the sphere surface without boundary and not the three-dimensional body.

  5. Biosphere 2 - Wikipedia

    en.wikipedia.org/wiki/Biosphere_2

    Its mission is to serve as a center for research, outreach, teaching, and lifelong learning about Earth, its living systems, and its place in the universe. [1] It is a 3.14-acre (1.27-hectare) [ 2 ] structure originally built to be an artificial, materially closed ecological system , or vivarium .

  6. Copernican principle - Wikipedia

    en.wikipedia.org/wiki/Copernican_principle

    The Earth's central position had been interpreted as being in the "lowest and filthiest parts". Instead, as Galileo said, the Earth is part of the "dance of the stars" rather than the "sump where the universe's filth and ephemera collect". [4] [5] In the late 20th Century, Carl Sagan asked, "Who are we? We find that we live on an insignificant ...

  7. History of the center of the Universe - Wikipedia

    en.wikipedia.org/wiki/History_of_the_center_of...

    The Flat Earth model is a belief that the Earth's shape is a plane or disk covered by a firmament containing heavenly bodies. Most pre-scientific cultures have had conceptions of a Flat Earth, including Greece until the classical period , the Bronze Age and Iron Age civilizations of the Near East until the Hellenistic period , India until the ...

  8. Earth - Wikipedia

    en.wikipedia.org/wiki/Earth

    Earth's hydrosphere is the sum of Earth's water and its distribution. Most of Earth's hydrosphere consists of Earth's global ocean. Earth's hydrosphere also consists of water in the atmosphere and on land, including clouds, inland seas, lakes, rivers, and underground waters.

  9. Social studies - Wikipedia

    en.wikipedia.org/wiki/Social_studies

    In many countries' curricula, social studies is the combined study of humanities, the arts, and social sciences, mainly including history, economics, and civics.The term was first coined by American educators around the turn of the twentieth century as a catch-all for these subjects, as well as others which did not fit into the models of lower education in the United States such as philosophy ...

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