Mercury - Icy Planet? (APOD 08 Oct 2008)
- emc
- Equine Locutionist
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Mercury - Icy Planet? (APOD 08 Oct 2008)
http://apod.nasa.gov/apod/ap081008.html
The thing that is most striking for me regarding the Messenger mission is the incredible amount of detail that is available on the web. The amount of information is amazing and the NASA Messenger website is way cool. 8)
Mercury may be shrinking and there may be ice on the surface.
The thing that is most striking for me regarding the Messenger mission is the incredible amount of detail that is available on the web. The amount of information is amazing and the NASA Messenger website is way cool. 8)
Mercury may be shrinking and there may be ice on the surface.
Last edited by emc on Wed Oct 08, 2008 6:41 pm, edited 1 time in total.
-
- Commander
- Posts: 507
- Joined: Thu Jul 27, 2006 5:20 pm
Planet Radius(k) Mass (kg)
Mercury......2439.........3.30e23
Mars...........3397.........6.42e23
Earth
Moon..........1738.........7.35e22
Jupiter
Ganymede..2631.........1.48e23
Callisto.......2400.........1.08e23
Io...............1815.........8.94e22
Europa........1569.........4.80e22
Saturn
Titan...........2575.........1.35e23
Uranus
Titania..........789.........3.49e21
Neptune
Triton..........1350.........2.14e22
Pluto...........1160.........1.31e22
Some planetary size facts
Mercury......2439.........3.30e23
Mars...........3397.........6.42e23
Earth
Moon..........1738.........7.35e22
Jupiter
Ganymede..2631.........1.48e23
Callisto.......2400.........1.08e23
Io...............1815.........8.94e22
Europa........1569.........4.80e22
Saturn
Titan...........2575.........1.35e23
Uranus
Titania..........789.........3.49e21
Neptune
Triton..........1350.........2.14e22
Pluto...........1160.........1.31e22
Some planetary size facts
- neufer
- Vacationer at Tralfamadore
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- Location: Alexandria, Virginia
BMAONE23 wrote:Planet Radius(k) Mass (kg)
Mercury......2439.........3.30e23
Mars...........3397.........6.42e23
Earth
Moon..........1738.........7.35e22
Jupiter
Ganymede..2631.........1.48e23
Callisto.......2400.........1.08e23
Io...............1815.........8.94e22
Europa........1569.........4.80e22
Saturn
Titan...........2575.........1.35e23
Uranus
Titania..........789.........3.49e21
Neptune
Triton..........1350.........2.14e22
Pluto...........1160.........1.31e22
Some planetary size facts
Code: Select all
Ordered according to Mass:
Planet........Radius(k)... Mass (kg)
---------------------------------------
Mars............3397.........64.2e22
Mercury.........2439.........33.0e22
Ganymede........2631.........14.8e22
Titan...........2575.........13.5e23
Callisto........2400.........10.8e22
Io..............1815.........8.94e22
Moon............1738.........7.35e22
Europa..........1569.........4.80e22
Triton..........1350.........2.14e22
Eris............1300.........1.67e22
Pluto...........1160.........1.31e22
Art Neuendorffer
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- Science Officer
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Lines - Canyong - Whatever
I suspect from the many lines running (radiating? Is that the correct word?) from the poles that when closer photos come in we are going to have a debate which repeats the Martian Phoboesn debate - geyers .. steam vents - meteor strikes - canals carrying water - etc.. (Oops - or are they running from the poles?)
If man were made to fly he wouldn't need alcohol .. lots and lots and lots of alcohol to get through the furors while maintaining the fervors.
- neufer
- Vacationer at Tralfamadore
- Posts: 18805
- Joined: Mon Jan 21, 2008 1:57 pm
- Location: Alexandria, Virginia
Vivaldi & other double-ring crater basins
------------------------------
Mercury : Vivaldi
http://messenger.jhuapl.edu/gallery/sci ... age_id=219
....................................
<<Numerous double-ringed craters may be seen on mercury. The crater Bach appears in the south polar regions of the planet, along with several others. The double-ring structures are not as prominent on the better-known near side of the Moon, but quite a few may be found on the farside as well as polar regions. It seems plausible that this particular structure was obscured or obliterated by the extensive flooding on the lunar near side.>>
http://www.astro.lsa.umich.edu/~cowley/intro2.html
Moon : Mare Orientale
Craters on the Moon pass through a sequence of typical shapes that depends approximately on their sizes (diameters, D):
* D < 20 km: craters are basically bowl shaped. This is true of both lunar and terrestrial explosion craters.
* 20 < D < 100 km: craters show central peaks.
* 100 < D < 350 km: double-ring structures.
* D > 400 km: multi-ring basins.
------------------------------
Chicxulub
http://www.lpi.usra.edu/science/kring/e ... _hires.jpg
--------------------------------------------
Impact craters on Venus
http://www.athenapub.com/venus1.htm
http://astrogeology.usgs.gov/Projects/V ... rtype.html
--------------------------------------------
Tethys : Odysseus
-----------------------------------
Mercury : Vivaldi
http://messenger.jhuapl.edu/gallery/sci ... age_id=219
....................................
<<Numerous double-ringed craters may be seen on mercury. The crater Bach appears in the south polar regions of the planet, along with several others. The double-ring structures are not as prominent on the better-known near side of the Moon, but quite a few may be found on the farside as well as polar regions. It seems plausible that this particular structure was obscured or obliterated by the extensive flooding on the lunar near side.>>
http://www.astro.lsa.umich.edu/~cowley/intro2.html
Moon : Mare Orientale
Craters on the Moon pass through a sequence of typical shapes that depends approximately on their sizes (diameters, D):
* D < 20 km: craters are basically bowl shaped. This is true of both lunar and terrestrial explosion craters.
* 20 < D < 100 km: craters show central peaks.
* 100 < D < 350 km: double-ring structures.
* D > 400 km: multi-ring basins.
------------------------------
Chicxulub
http://www.lpi.usra.edu/science/kring/e ... _hires.jpg
--------------------------------------------
Impact craters on Venus
http://www.athenapub.com/venus1.htm
http://astrogeology.usgs.gov/Projects/V ... rtype.html
--------------------------------------------
Tethys : Odysseus
-----------------------------------
Art Neuendorffer