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  2. The Crack in Space - Wikipedia

    en.wikipedia.org/wiki/The_Crack_In_Space

    The "crack in space" is a defect in Jiffi-scuttler operation that allows access to the Earth (in Prominent Author) and to parallel Earths (in the later works) at various times and locations, beyond its intended use of providing near-instant transport between specific locations on the Earth in the present.

  3. Location of Earth - Wikipedia

    en.wikipedia.org/wiki/Location_of_Earth

    (110–210 Earth radii) 6.36×10 6 –1.27×10 7: 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: 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 ...

  4. Earth - Wikipedia

    en.wikipedia.org/wiki/Earth

    The extent of Earth's magnetic field in space defines the magnetosphere. Ions and electrons of the solar wind are deflected by the magnetosphere; solar wind pressure compresses the day-side of the magnetosphere, to about 10 Earth radii, and extends the night-side magnetosphere into a long tail. [150]

  5. Umbra, penumbra and antumbra - Wikipedia

    en.wikipedia.org/wiki/Umbra,_penumbra_and_antumbra

    Umbra, penumbra and antumbra of Earth and images that could be seen at some points in these areas (Note: the relative size and distance of the bodies shown are not to scale.)“… The Earth’s shadow has two distinct parts,… the UMBRA is the part of the shadow where all direct sunlight is blocked by the Earth; the PENUMBRA of the shadow is ...

  6. Magnetosphere - Wikipedia

    en.wikipedia.org/wiki/Magnetosphere

    In the space environment close to a planetary body with a dipole magnetic field such as Earth, the field lines resemble a simple magnetic dipole. Farther out, field lines can be significantly distorted by the flow of electrically conducting plasma , as emitted from the Sun (i.e., the solar wind ) or a nearby star.

  7. Geocentric model - Wikipedia

    en.wikipedia.org/wiki/Geocentric_model

    Adherence to the geocentric model stemmed largely from several important observations. First of all, if the Earth did move, then one ought to be able to observe the shifting of the fixed stars due to stellar parallax. Thus if the Earth was moving, the shapes of the constellations should change considerably over the course of a year. As they did ...

  8. Astronomical nutation - Wikipedia

    en.wikipedia.org/wiki/Astronomical_nutation

    An example of precession and nutation is the variation over time of the orientation of the axis of rotation of the Earth. This is important because the most commonly used frame of reference for measurement of the positions of astronomical objects is the Earth's equator — the so-called equatorial coordinate system. The effect of precession and ...

  9. Exosphere - Wikipedia

    en.wikipedia.org/wiki/Exosphere

    From the Earth's surface to the top of the stratosphere (50km) is just under 1% of Earth's radius. The exosphere is a thin, atmosphere-like volume surrounding a planet or natural satellite where molecules are gravitationally bound to that body, but where the density is so low that the molecules are essentially collision-less. [ 1 ]

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