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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. Five themes of geography - Wikipedia

    en.wikipedia.org/wiki/Five_themes_of_geography

    The five themes were published in 1984 [1] and widely adopted by teachers, textbook publishers, and curriculum designers in the United States. [2] Most American geography and social studies classrooms have adopted the five themes in teaching practices, [ 3 ] as they provide "an alternative to the detrimental, but unfortunately persistent, habit ...

  4. Outline of Earth - Wikipedia

    en.wikipedia.org/wiki/Outline_of_Earth

    Earth's location in the Universe. Universe – all of time and space and its contents.. Observable universe – spherical region of the Universe comprising all matter that may be observed from Earth at the present time, because light and other signals from these objects have had time to reach Earth since the beginning of the cosmological expansion.

  5. Template:Earth's location in the Universe - Wikipedia

    en.wikipedia.org/wiki/Template:Earth's_location...

    Earth → Solar System → Local Interstellar Cloud → Local Bubble → Gould Belt → Orion Arm → Milky Way → Milky Way subgroup → Local Group → Local Sheet → Virgo Supercluster → Laniakea Supercluster → Local Hole → Observable universeUniverse Each arrow (→) may be read as "within" or "part of".

  6. Geography - Wikipedia

    en.wikipedia.org/wiki/Geography

    Geographers study the Earth's spatial and temporal distribution of phenomena, processes, and features as well as the interaction of humans and their environment. [22] Because space and place affect a variety of topics, such as economics, health, climate, plants, and animals, geography is highly interdisciplinary. The interdisciplinary nature of ...

  7. List of Solar System objects - Wikipedia

    en.wikipedia.org/wiki/List_of_Solar_System_objects

    Human-made objects orbiting the Sun, Mercury, Venus, Earth, Mars, and Saturn, including active artificial satellites and space junk; Heliosphere, a bubble in space produced by the solar wind Heliosheath. Heliopause; Hydrogen wall, a pile up of hydrogen from the interstellar medium

  8. 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 ...

  9. 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.

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