Difference between revisions 1706685 and 1733608 on enwikiversity

[[Image:Skylab-73-HC-440HR.jpg|thumb|right|200px|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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|publisher=Wikimedia Foundation, Inc
|location=San Francisco, California
|month=October 4,
|year=2012
|url=https://en.wikipedia.org/wiki/Super_High_Altitude_Research_Project
|accessdate=2013-12-13 }}</ref>

“The large g-force experienced by a ballistic projectile would likely mean that a space gun would be incapable of safely launching humans or delicate instruments, rather being restricted to freight or ruggedized satellites."
<ref name=SpaceGun/>

"Atmospheric drag also makes it more difficult to control the trajectory of any projectile launched, subjects the projectile to extremely high forces, and causes severe energy losses that may not be easily overcome."<ref name=SpaceGun/>

"The lower troposphere is the densest layer of the atmosphere, and some of these issues may be mitigated by using a space gun with a "gun barrel" reaching above it (e.g. a gun emplacement on a mountaintop)."<ref name=SpaceGun/>

"A space gun, by itself, is generally not capable of placing objects into stable orbit around the planet, unless the objects are able to perform course corrections after launch.”<ref name=PartofTitleSpaceGun>{{ cite web
|title=article titleSpace gun, In: ''Wikipedia''
|publisher=Wikimedia Foundation, Inc
|location=San Francisco, California
|month=December 9,
|year=2011
|url=https://en.wikipedia.org/wiki/Space_gun
|accessdate=2011-12-9 }}</ref>
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(contracted; show full)[[Category:Astronomy/Lectures]]
[[Category:Astrophysics/Lectures]]
[[Category:History/Lectures]]
[[Category:Radiation astronomy/Lectures]]
[[Category:Resources last modified in October 2016]]
[[Category:Technology/Lectures]]
[[Category:Vehicles/Lectures]]
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