Difference between revisions 1977622 and 2021013 on enwikiversity

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Draft:Lofting technology
[[Image:Skylab-73-HC-440HR.jpg|thumb|right|250px|The Saturn V SA-513 lifts off to boost the Skylab Orbital Workshop into Earth orbit on March 14, 1973. Credit: NASA.]]
Astronomy is performed by location and is subject to local conditions. The shapes and sizes of observatories have changed over time, as have their altitude. The motivations for putting an observatory manned or unmanned at different altitudes has led to a great variety in '''lofting technology'''.
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(contracted; show full)* [[w:Stratosphere|Stratosphere]] &mdash; Troposphere to 50 km
* [[w:Mesosphere|Mesosphere]] &mdash; Stratosphere to 85 km
* [[w:Thermosphere|Thermosphere]] &mdash; Mesosphere to 675 km
* [[w:Exosphere|Exosphere]] &mdash; Thermosphere to 10,000 km.

==Earth radius==
{{main|Distances/Radius/Earth|Earth radius}}
[[Image:Lowresg
heoidheight.jpg|thumb|right|400px|The diagram shows variation from the ellipsoid and sea level. Credit: .]]
Because the Earth is not perfectly spherical, no single value serves as its natural radius. Distances from points on the surface to the center range from 6,353 km to 6,384 km. ''Earth radius'' is also used as a unit of distance, especially in astronomy and [[geology]]. It is usually denoted by <math>R_\oplus</math>. Earth's rotation, internal density variations, and external (contracted; show full)
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