Difference between revisions 1514395 and 1514403 on enwikiversity

[[Image:Ice cap.jpg|thumb|right|200px|This is an aerial image of the ice cap on Ellesmere Island, Canada. Credit: National Snow and Ice Data Center.]]
'''Earth''' is rocky astronomical object, a liquid object, a gaseous object, and a plasma object.
{{clear}}

==Radiation astronomy==
{{main|Radiation astronomy}}
(contracted; show full)==Exospheres==
{{main|Astronomy/Atmospheres/Exospheres|Exospheres}}

Into the exosphere or outer space, temperature rises from around 1,500°C to upwards of 100,000 K.

==Sun==
{{main|Stars/Sun|Sun (star)}}

[[Image:Sun rise in Kodachadri.JPG|thumb|right|200px|The image shows a sunrise in Kodachadri. Credit: [[commons:User:Chinmayahd|Chinmayahd]].]]
[[Image:Orange Sun in Boracay, Philippines.jpg|thumb|left|200px|The image shows an orange sun in Boracay, Philippines. Credit: [[commons:User:Sarahr|Sarahr]].]]
The Sun passes overhead every day on Earth. The size of its disc is very close to that of the Moon.

"Regarding the fixed stars, the Sun appears from Earth to revolve once a year along the [[w:ecliptic|ecliptic]] through the zodiac, and so Greek astronomers considered it to be one of the seven [[w:planet|planet]]s (Greek ''planetes'', "wanderer"), after which the seven days of the [[w:week|week]] are named in some languages.<ref name=oed>{{ cite web
(contracted; show full)|issue=
|pages=151-7
|url=http://www.jstor.org/stable/10.2307/283452
|arxiv=
|bibcode=
|doi=
|pmid=
|accessdate=2012-04-24 }}</ref>
⏎
{{clear}}

==Tephra layers==
{{main|Geochronology/Tephra layers|Tephra layers}}
[[Image:Ashfall from Pinatubo, 1991.jpg|thumb|right|200px|The volcanic eruption from Mount Pinatubo deposits a snowlike blanket of tephra on June 15, 1991. Credit: R.P. Hoblitt, USGS.]]
An ashfall occurs from a nearby volcano, before the locals can leave the area or maybe even go to work.
{{clear}}

(contracted; show full)[[Category:Astronomy learning projects]]
[[Category:Planetary science]]
[[Category:Research]]
[[Category:Research projects]]
[[Category:Resources last modified in February 2016]]
{{experimental}}{{research}}{{article}}{{lecture}}{{astronomy}}

<!-- interlanguage links -->