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  2. Low Earth orbit - Wikipedia

    en.wikipedia.org/wiki/Low_Earth_orbit

    A low Earth orbit (LEO) is an orbit around Earth with a period of 128 minutes or less (making at least 11.25 orbits per day) and an eccentricity less than 0.25. [1]

  3. List of orbits - Wikipedia

    en.wikipedia.org/wiki/List_of_orbits

    Average altitude of 384,403 kilometres (238,857 mi), elliptical-inclined orbit. Beyond-low Earth orbit (BLEO) and beyond Earth orbit (BEO) are a broad class of orbits that are energetically farther out than low Earth orbit or require an insertion into a heliocentric orbit as part of a journey that may require multiple orbital insertions ...

  4. Very low Earth orbit - Wikipedia

    en.wikipedia.org/wiki/Very_low_Earth_orbit

    Very low Earth orbit is a range of orbital altitudes below 400 km (250 mi), and is of increasing commercial importance in a variety of scenarios and for multiple applications, in both private and government satellite operations.

  5. Non-rocket spacelaunch - Wikipedia

    en.wikipedia.org/wiki/Non-rocket_spacelaunch

    All forms of projectile launchers are at least partially hybrid systems if launching to low Earth orbit, due to the requirement for orbit circularization, at a minimum entailing approximately 1.5 percent of the total delta-v to raise perigee (e.g. a tiny rocket burn), or in some concepts much more from a rocket thruster to ease ground ...

  6. Hubble Space Telescope - Wikipedia

    en.wikipedia.org/wiki/Hubble_Space_Telescope

    The Hubble Space Telescope (often referred to as HST or Hubble) is a space telescope that was launched into low Earth orbit in 1990 and remains in operation. It was not the first space telescope, but it is one of the largest and most versatile, renowned as a vital research tool and as a public relations boon for astronomy.

  7. Small-lift launch vehicle - Wikipedia

    en.wikipedia.org/wiki/Small-lift_launch_vehicle

    A small-lift launch vehicle is a rocket orbital launch vehicle that is capable of lifting 2,000 kilograms (4,400 lb) or less (by NASA classification) or under 5,000 kilograms (11,000 lb) (by Roscosmos classification) [1] of payload into low Earth orbit (LEO). The next larger category consists of medium-lift launch vehicles. [2]

  8. Kessler syndrome - Wikipedia

    en.wikipedia.org/wiki/Kessler_syndrome

    The debris poses a substantial risk to low-Earth orbit constellations, particularly those orbiting below 800 kilometers, and may remain in orbit for years, increasing the likelihood of collisions. This incident highlights ongoing concerns about space debris and the increasing risk of a cascading effect as more objects are launched into orbit.

  9. Commercial LEO Destinations program - Wikipedia

    en.wikipedia.org/wiki/Commercial_LEO...

    The Commercial LEO Destinations program (CLD, or Commercial Destinations in Low Earth Orbit, or Commercial low Earth orbit (LEO) Development Program) is a public/private partnership program of the NASA, to help facilitate the building of private commercial space stations (CSSs) in low Earth orbit.