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  2. Medium Earth orbit - Wikipedia

    en.wikipedia.org/wiki/Medium_Earth_orbit

    Clickable image, highlighting medium altitude orbits around Earth, [a] from Low Earth to the lowest High Earth orbit (geostationary orbit and its graveyard orbit, at one ninth of the Moon's orbital distance), [b] with the Van Allen radiation belts and the Earth to scale To-scale diagram of low, medium, and high Earth orbits Space of Medium Earth orbits (MEO) as pink area, with Earth and the ...

  3. Wikipedia:Vital articles/Level/5/Geography - Wikipedia

    en.wikipedia.org/.../Level/5/Geography

    Download as PDF; Printable version; In other projects Wikidata item; Appearance. move to sidebar hide Level 5 Sublists. This page was ... Level 5 Sublists

  4. Wikipedia : Vital articles/Level/5/Physical sciences/Earth ...

    en.wikipedia.org/.../Physical_sciences/Earth_science

    Vital articles is a list of subjects for which Wikipedia should have corresponding high-quality articles. It serves as a centralized watchlist to track the status of Wikipedia's most essential articles.

  5. Near-Earth object - Wikipedia

    en.wikipedia.org/wiki/Near-Earth_object

    If a near-Earth object is near the part of its orbit closest to Earth's at the same time Earth is at the part of its orbit closest to the near-Earth object's orbit, the object has a close approach, or, if the orbits intersect, could even impact the Earth or its atmosphere.

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  7. Middle latitudes - Wikipedia

    en.wikipedia.org/wiki/Middle_latitudes

    World map with the middle latitudes highlighted in red Extratropical cyclone formation areas. The middle latitudes, also called the mid-latitudes (sometimes spelled midlatitudes) or moderate latitudes, are spatial regions on either hemisphere of Earth, located between the Tropic of Cancer (latitude 23°26′09.7″) and the Arctic Circle (66°33′50.3″) in the northern hemisphere and ...

  8. Overview effect - Wikipedia

    en.wikipedia.org/wiki/Overview_effect

    Early photos of Earth taken from space have inspired a mild version of the overview effect in earthbound viewers. [1] The images became prominent symbols of environmental concern and have been credited for raising the public's consciousness about the fragility of Earth and expanding concern for long-term survival on a finite planet. [1]

  9. Bedford Level experiment - Wikipedia

    en.wikipedia.org/wiki/Bedford_Level_experiment

    The Old Bedford River, photographed from the bridge at Welney, Norfolk (2008); the camera is looking downstream, south-west of the bridge. The Bedford Level experiment was a series of observations carried out along a 6-mile (10 km) length of the Old Bedford River on the Bedford Level of the Cambridgeshire Fens in the United Kingdom during the 19th and early 20th centuries to deny the curvature ...