Jump to content

Green Valley (Mars): Difference between revisions

Coordinates: 68°21′N 233°00′E / 68.35°N 233°E / 68.35; 233
From Wikipedia, the free encyclopedia
Browse history interactively
← Previous edit
Content deleted Content added
VisualWikitext
I don't know whether the fact the image is from HiRISE matters here, but at least wikilink to what HiRISE is
Not a stub: 10+ sentences with multiple refs.
 
(32 intermediate revisions by 29 users not shown)
Line 1: Line 1:
{{Short description|Region in the northern hemisphere of Mars; landing site of NASA's Phoenix lander}}
{{MarsGeo-Valley
{{Use dmy dates|date=May 2023}}
⚫
|image=[[Image:PSP 001497 2480 RED detail 25cm.jpg|250px]]
{{Infobox feature on celestial object
⚫
|caption=[[HiRISE]] image of a patch of land in the Green Valley region showing scattered small boulders and a polygonal fracture pattern.
|name=Green Valley
|name = Green Valley
⚫
|image = [[File:PSP 001497 2480 RED detail 25cm.jpg|250px]]
|latitude=68.35
⚫
|caption = [[HiRISE]] image of a patch of land in the Green Valley region showing scattered small boulders and a polygonal fracture pattern.
|N_or_S=N
|coordinates = {{coord|68.35|N|233|E|globe:mars_type:landmark|display=inline,title}}
|longitude=233
⚫
|naming = Informal name based on danger assessment map color
|E_or_W=E
}}
|length=
⚫
|naming=Informal name based on danger assessment map color}}


'''Green Valley''' is a region on [[Mars (planet)|Mars]] within [[Vastitas Borealis]] that was chosen as the landing site of [[NASA]]'s [[Phoenix (spacecraft)|Phoenix]] lander. It is located at 68.35 degrees north, 233 degrees east. The valley is about 50 kilometers wide but only about 250 meters deep; either it was filled in or was never any deeper than that. The edges are not visible from the middle of the valley.<ref name=planetaryorg>http://www.planetary.org/news/2007/0125_A_Green_Valley_for_Phoenix.html</ref>
'''Green Valley''' is a region on [[Mars]] within [[Vastitas Borealis]] that was chosen as the landing site of [[NASA]]'s [[Phoenix (spacecraft)|Phoenix]] lander. It is located at 68.35 degrees north, 233 degrees east. The valley is about 50 kilometres wide, but only about 250 metres deep; either it was filled in, or was never any deeper than that. The edges are not visible from the middle of the valley.<ref name=planetaryorg>[http://www.planetary.org/news/2007/0125_A_Green_Valley_for_Phoenix.html A Green Valley for Phoenix – Planetary News | The Planetary Society<!-- Bot generated title -->] {{webarchive|url=https://web.archive.org/web/20080513154224/http://www.planetary.org/news/2007/0125_A_Green_Valley_for_Phoenix.html |date=13 May 2008 }}</ref>
⚫
[[File:Mars from Phoenix.jpg|thumb|150px|left|Polygonal patterns at Phoenix landing site]]
⚫
The name "Green Valley" is not officially recognised by the [[International Astronomical Union]]. It came from the decision process by which it was selected as Phoenix's landing site: prospective landing areas were color-coded based on how hazardous they were, with red being most hazardous through yellow to green being the safest.<ref name=planetaryorg /> Green Valley has relatively few of the large boulders that could have tipped the lander if it had hit one during touchdown.<ref>[https://www.newscientist.com/article/dn13661-mars-lander-aims-for-touchdown-in-green-valley.html Mars lander aims for touchdown in 'Green Valley' – space – 11 April 2008 – New Scientist Space<!-- Bot generated title -->]</ref>


⚫
The ground within Green Valley is covered with polygonal features several metres across and roughly ten centimetres high, thought to be caused either by thermal contraction ([[Patterned ground|ice-wedge polygon]]s) or by the effects of wind-blown dust (sand-wedge polygons). Water ice is thought to be just below the surface.<ref name=planetaryorg /> During the local winter as much as three feet of [[carbon dioxide ice]] is expected to appear on the surface.<ref>[http://www.space.com/missionlaunches/070201_phoenix_update.html SPACE.com – Phoenix Lander Readied For Mars Exploration<!-- Bot generated title -->]</ref>
⚫
The name "Green Valley" is not officially recognised by the [[International Astronomical Union]]. It came from the decision process by which it was selected as Phoenix's landing site: prospective landing areas were color-coded based on how hazardous they were, with red being most hazardous through yellow to green being the safest.<ref name=planetaryorg /> Green Valley has relatively few of the large boulders that could potentially have tipped the lander if it had hit one during touchdown.<ref>http://space.newscientist.com/article/dn13661-mars-lander-aims-for-touchdown-in-green-valley.html</ref>


⚫
Shortly before Phoenix's scheduled landing, the [[Mars Reconnaissance Orbiter]] photographed a pair of kilometer-tall [[dust devil]]s in the Green Valley area.<ref>[https://www.newscientist.com/article/dn13852-dust-devils-spotted-at-mars-probes-landing-site.html Dust devils spotted at Mars probe's landing site – space – 7 May 2008 – New Scientist Space<!-- Bot generated title -->]</ref>
⚫
The ground within Green Valley is covered with polygonal features several meters across and roughly ten centimeters high, thought to be caused either by repeated freeze-thaw cycles ([[Patterned ground|ice-wedge polygon]]s) or by the effects of wind-blown dust ([[sand-wedge polygon]]s). Water ice is thought to be just below the surface.<ref name=planetaryorg /> During the local winter as much as three feet of [[carbon dioxide ice]] is expected to appear on the surface.<ref>http://www.space.com/missionlaunches/070201_phoenix_update.html</ref>
{{clear}}

⚫
[[Image:Mars from Phoenix.jpg|thumb|200px|right|Polygonal patterns at Phoenix landing site]]
⚫
Shortly before Phoenix's scheduled landing, the [[Mars Reconnaissance Orbiter]] photographed a pair of kilometer-tall [[dust devil]]s in the Green Valley area.<ref>http://space.newscientist.com/article/dn13852-dust-devils-spotted-at-mars-probes-landing-site.html</ref>


==References==
==References==
{{reflist}}
{{Reflist}}

==Further reading==
*{{cite journal|author=Arvidson|title=Mars Exploration Program 2007 Phoenix landing site selection and characteristics|year=2008|journal=[[Journal of Geophysical Research]]|volume=113|doi=10.1029/2007JE003021|last2=Adams|first2=D.|last3=Bonfiglio|first3=G.|last4=Christensen|first4=P.|last5=Cull|first5=S.|last6=Golombek|first6=M.|last7=Guinn|first7=J.|last8=Guinness|first8=E.|last9=Heet|first9=T.|issue=E6|pages=E00A03|bibcode = 2008JGRE..113.0A03A |display-authors=1|doi-access=free}}
{{clear}}


{{Features and artificial objects on Mars}}
{{Mars-stub}}
{{Geography of Mars}}


[[Category:Valleys and canyons on Mars]]
[[Category:Valleys and canyons on Mars]]
[[Category:Mare Boreum quadrangle]]

Latest revision as of 01:02, 11 November 2024

Green Valley
HiRISE image of a patch of land in the Green Valley region showing scattered small boulders and a polygonal fracture pattern.
Coordinates68°21′N 233°00′E / 68.35°N 233°E / 68.35; 233
NamingInformal name based on danger assessment map color

Green Valley is a region on Mars within Vastitas Borealis that was chosen as the landing site of NASA's Phoenix lander. It is located at 68.35 degrees north, 233 degrees east. The valley is about 50 kilometres wide, but only about 250 metres deep; either it was filled in, or was never any deeper than that. The edges are not visible from the middle of the valley.[1]

Polygonal patterns at Phoenix landing site

The name "Green Valley" is not officially recognised by the International Astronomical Union. It came from the decision process by which it was selected as Phoenix's landing site: prospective landing areas were color-coded based on how hazardous they were, with red being most hazardous through yellow to green being the safest.[1] Green Valley has relatively few of the large boulders that could have tipped the lander if it had hit one during touchdown.[2]

The ground within Green Valley is covered with polygonal features several metres across and roughly ten centimetres high, thought to be caused either by thermal contraction (ice-wedge polygons) or by the effects of wind-blown dust (sand-wedge polygons). Water ice is thought to be just below the surface.[1] During the local winter as much as three feet of carbon dioxide ice is expected to appear on the surface.[3]

Shortly before Phoenix's scheduled landing, the Mars Reconnaissance Orbiter photographed a pair of kilometer-tall dust devils in the Green Valley area.[4]

References

[edit]
  1. ^ a b c A Green Valley for Phoenix – Planetary News | The Planetary Society Archived 13 May 2008 at the Wayback Machine
  2. ^ Mars lander aims for touchdown in 'Green Valley' – space – 11 April 2008 – New Scientist Space
  3. ^ SPACE.com – Phoenix Lander Readied For Mars Exploration
  4. ^ Dust devils spotted at Mars probe's landing site – space – 7 May 2008 – New Scientist Space

Further reading

[edit]
  • Arvidson; et al. (2008). "Mars Exploration Program 2007 Phoenix landing site selection and characteristics". Journal of Geophysical Research. 113 (E6): E00A03. Bibcode:2008JGRE..113.0A03A. doi:10.1029/2007JE003021.


Map of Mars
Interactive image map of the global topography of Mars, overlaid with the position of Martian rovers and landers. Coloring of the base map indicates relative elevations of Martian surface.
Clickable image: Clicking on the labels will open a new article.
(   Active •   Inactive •   Planned)
Bradbury Landing
Deep Space 2
Mars Polar Lander
Perseverance
Schiaparelli EDM
Spirit
Viking 1
Retrieved from "https://en.wikipedia.org/enwiki/w/index.php?title=Green_Valley_(Mars)&oldid=1256667536"