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  2. Location of Earth - Wikipedia

    en.wikipedia.org/wiki/Location_of_Earth

    The space dominated by Earth's magnetic field and its magnetotail, shaped by the solar wind. [17] Earth's orbit: 299.2 million km [b] 2 AU [c] 2.99×10 8: 8.48: The average diameter of the orbit of the Earth relative to the Sun. Encompasses the Sun, Mercury and Venus. [18] Inner Solar System ~6.54 AU 9.78×10 8: 8.99

  3. 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.

  4. Rare Earth: Why Complex Life Is Uncommon in the Universe

    en.wikipedia.org/wiki/Rare_Earth:_Why_Complex...

    Rare Earth was succeeded in 2003 by the follow-on book The Life and Death of Planet Earth: How the New Science of Astrobiology Charts the Ultimate Fate of our World, also by Ward and Brownlee, which talks about the Earth's long-term future and eventual demise under a warming and expanding Sun, showing readers the concept that planets like Earth ...

  5. Axis mundi - Wikipedia

    en.wikipedia.org/wiki/Axis_mundi

    In astronomy, axis mundi is the Latin term for the axis of Earth between the celestial poles. In a geocentric coordinate system, this is the axis of rotation of the celestial sphere. Consequently, in ancient Greco-Roman astronomy, the axis mundi [1] is the axis of rotation of the planetary spheres within the classical geocentric model of the ...

  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. Biosphere 2 - Wikipedia

    en.wikipedia.org/wiki/Biosphere_2

    University of Arizona Biosphere 2 is an American Earth system science research facility located in Oracle, Arizona. 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]

  8. Observable universe - Wikipedia

    en.wikipedia.org/wiki/Observable_universe

    The observable universe is a spherical region of the universe consisting of all matter that can be observed from Earth or its space-based telescopes and exploratory probes at the present time; the electromagnetic radiation from these objects has had time to reach the Solar System and Earth since the beginning of the cosmological expansion.

  9. Deferent and epicycle - Wikipedia

    en.wikipedia.org/wiki/Deferent_and_epicycle

    Furthermore, if they were scaled so that the Earth's orbit was the same in all of them, the ordering of the planets we recognize today easily followed from the math. Mercury orbited closest to the Sun and the rest of the planets fell into place in order outward, arranged in distance by their periods of revolution. [12]: 54

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