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  2. Asteroid impact avoidance - Wikipedia

    en.wikipedia.org/wiki/Asteroid_impact_avoidance

    In 1967, graduate students under Professor Paul Sandorff at the Massachusetts Institute of Technology were tasked with designing a method to prevent a hypothetical 18-month distant impact on Earth by the 1.4-kilometer-wide (0.87 mi) asteroid 1566 Icarus, an object that makes regular close approaches to Earth, sometimes as close as 16 lunar ...

  3. 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 ...

  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. Cosmic distance ladder - Wikipedia

    en.wikipedia.org/wiki/Cosmic_distance_ladder

    Radar is used to measure the distance between the orbits of the Earth and of a second body. From that measurement and the ratio of the two orbit sizes, the size of Earth's orbit is calculated. The Earth's orbit is known with an absolute precision of a few meters and a relative precision of a few parts in 100 billion (1 × 10 −11).

  6. Near-Earth object - Wikipedia

    en.wikipedia.org/wiki/Near-Earth_object

    These are asteroids in a near-Earth orbit without the tail or coma of a comet. As of December 2024, 37,255 near-Earth asteroids (NEAs) are known, 2,465 of which are both sufficiently large and may come sufficiently close to Earth to be classified as potentially hazardous. [1] NEAs survive in their orbits for just a few million years. [27]

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

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

    Level 5 Sublists This page was last edited on 26 June 2024, at 15:53 (UTC). Text is available under the Creative Commons Attribution-ShareAlike 4.0 License ...

  8. Remove Banner Ads with Ad-Free AOL Mail | AOL Products

    www.aol.com/products/utilities/ad-free-mail

    SYSTEM REQUIREMENTS. Mobile and desktop browsers: Works best with the latest version of Chrome, Edge, FireFox and Safari. Windows: Windows 7 and newer Mac: MacOS X and newer Note: Ad-Free AOL Mail ...

  9. Michelson–Morley experiment - Wikipedia

    en.wikipedia.org/wiki/Michelson–Morley_experiment

    If the Earth is traveling through an aether medium, a light beam traveling parallel to the flow of that aether will take longer to reflect back and forth than would a beam traveling perpendicular to the aether, because the increase in elapsed time from traveling against the aether wind is more than the time saved by traveling with the aether wind.