Difference between revisions 2301570 and 2301571 on enwikiversity

[[Image:Ice cap.jpg|thumb|right|250px|This is an aerial image of the ice cap on Ellesmere Island, Canada. Credit: National Snow and Ice Data Center.]]
'''Earth''' is a rocky astronomical object, a liquid object, a gaseous object, and a plasma object.
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==Astronomy==
[[Image:Greenland 42.74746W 71.57394N.jpg|thumb|right|250px|Satellite composite image shows the ice sheet of Greenland. Credit: NASA.]]
(contracted; show full)==Technology==
{{main|Technology}}
[[Image:Methane measurements siberia.jpe.jpeg|thumb|right|250px|An under water, under ice bubble trap is installed on a lake in Siberia. Credit: Katey Walter.]]
Here at the right an under water, under-ice bubble trap is installed in a lake in Siberia.
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==Aircraft==
{{main|Airborne
/Astronomy|Airborne astronomy}}
[[Image:446826main ED10-0080-03c 946-710.jpg|thumb|right|250px|The SOFIA observatory is flying with 100% open telescope door. Credit: NASA.]]
The "Stratospheric Observatory for Infrared Astronomy [(SOFIA) is] mounted onboard a Boeing 747SP. [...] SOFIA’s 2.7 m mirror and optimized telescope system combines the highest available spatial resolution with excellent sensitivity. SOFIA will operate in both celestial hemispheres for the next two decades."<ref name=Krabbe>{{ cite book
| author=Alfred Krabbe
| title=SOFIA telescope, In: ‘’Proceedings of SPIE: Astronomical Telescopes and Instrumentation’’
| pages=276–281
| date=March 2007
| publisher=SPIE — The International Society for Optical Engineering
| location=Munich, Germany
|url=http://arxiv.org/pdf/astro-ph/0004253v1.pdf
| arxiv=astro-ph/0004253 }}</ref>

It has an operating altitude of 12-14 km, 39,000-45,000 ft and a spatial resolution of 1-3" for 0.3 < λ < 15 µm, and λ/10" for λ > 15 µm.<ref name=Krabbe/> 
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==Hypotheses==
{{main|Hypotheses}}
# Earth is a rocky object throughout most of its interior and exterior.

==See also==
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* [[Solar System, technical/Earth]]
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==References==
{{reflist|2}}

==External links==

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{{Radiation astronomy resources}}{{Sisterlinks|Earth}}

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[[Category:Astronomical objects/Lectures]]
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