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  2. Space debris - Wikipedia

    en.wikipedia.org/wiki/Space_debris

    As of the 2010s, several technical approaches to the mitigation of the growth of space debris are typically undertaken, yet no comprehensive legal regime or cost assignment structure is in place to reduce space debris in the way that terrestrial pollution has reduced since the mid-20th century.

  3. Space sustainability - Wikipedia

    en.wikipedia.org/wiki/Space_sustainability

    The space field should be used peacefully, jointly protect the space field from harm, and maximize space utilization through environmental, economic, and security exploration of space. [16] These consensuses also clarify the relationship between space sustainability and international security, that states and individuals explore space for ...

  4. Space environment - Wikipedia

    en.wikipedia.org/wiki/Space_environment

    Space environment is a branch of astronautics, aerospace engineering and space physics that seeks to understand and address conditions existing in space that affect the design and operation of spacecraft.

  5. Sky - Wikipedia

    en.wikipedia.org/wiki/Sky

    The Milky Way can be seen as a large band across the night sky, and is distorted into an arch in this 360° panorama. The term night sky refers to the sky as seen at night. The term is usually associated with skygazing and astronomy , with reference to views of celestial bodies such as stars, the Moon, and planets that become visible on a clear ...

  6. Interplanetary contamination - Wikipedia

    en.wikipedia.org/wiki/Interplanetary_contamination

    Interplanetary contamination refers to biological contamination of a planetary body by a space probe or spacecraft, either deliberate or unintentional. There are two types of interplanetary contamination: Forward contamination is the transfer of life and other forms of contamination from Earth to another celestial body.

  7. Natural environment - Wikipedia

    en.wikipedia.org/wiki/Natural_environment

    A river is a natural watercourse, [7] usually freshwater, flowing toward an ocean, a lake, a sea or another river. A few rivers simply flow into the ground and dry up completely without reaching another body of water. Rocky stream in the U.S. state of Hawaii. The water in a river is usually in a channel, made up of a stream bed between banks.

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  9. Space ethics - Wikipedia

    en.wikipedia.org/wiki/Space_ethics

    In total, an estimated 80 tons of space debris re-enter Earth's atmosphere every year. Due to the high friction with the atmospheric gases, the debris burns up, causing the release of its chemical components, which may contribute to atmospheric pollution and ozone depletion. [12] Additionally, space debris orbits the Earth at extremely high ...