Go Back   IceInSpace > General Astronomy > Astronomy and Amateur Science
Register FAQ Calendar Today's Posts Search

Reply
 
Thread Tools Rate Thread
  #1  
Old 26-05-2007, 07:23 PM
ispom's Avatar
ispom
admirer of the sky

ispom is offline
 
Join Date: Nov 2006
Location: Germany
Posts: 429
Mars reliefs

I’ve seen today:
http://www.esa.int/images/324-020507...usMensae_L.jpg

http://www.esa.int/SPECIALS/Mars_Exp...S5V681F_0.html
a picture of Deuteronilus Mensae:
amzingly: 2000 m deep!
and the dark interior is said to be a sort of glacier debris…

sadly I see such pictures always inverse in relief,
insteed of a depression I see an elevation,
there are somebody also afflicted with that phenomenon?
fragt Ispom
Reply With Quote
  #2  
Old 26-05-2007, 09:08 PM
Orion's Avatar
Orion
Obsessed

Orion is offline
 
Join Date: Jan 2005
Location: Swansea N.S.W.
Posts: 1,107
Your not the only one I also suffer from that.
Reply With Quote
  #3  
Old 27-05-2007, 09:19 AM
acropolite's Avatar
acropolite (Phil)
Registered User

acropolite is offline
 
Join Date: Feb 2005
Location: Launceston Tasmania
Posts: 9,021
Funny, when I first viewed the image I saw a depression, now it's an elevation. I've found that if I think about which direction the light is coming from then it seems to have the correct perspective.
Reply With Quote
  #4  
Old 27-05-2007, 10:48 AM
bojan's Avatar
bojan
amateur

bojan is online now
 
Join Date: Jul 2006
Location: Mt Waverley, VIC
Posts: 7,113
It is not suffering form faulty operation of the brains ..
Simply, we are not getting enough information (both eyes are receiving the same image, no 3rd dimension info is present), so brain tries to interprete what's available, based on experience.
Try to rotate image 180 degrees, it works for me (sometimes) :-)
Reply With Quote
  #5  
Old 28-05-2007, 04:12 PM
glenc's Avatar
glenc (Glen)
star-hopper

glenc is offline
 
Join Date: Jun 2005
Location: Terranora
Posts: 4,406
Black Hole in Mars

http://antwrp.gsfc.nasa.gov/apod/ima...hirise_big.jpg

A Hole in Mars

Credit: NASA, JPL, U. Arizona Explanation: Black spots have been discovered on Mars that are so dark that nothing inside can be seen. Quite possibly, the spots are entrances to deep underground caves capable of protecting Martian life, where it to exist. The unusual hole pictured above was found on the slopes of the giant Martian volcano Arsia Mons. The above image was captured three weeks ago by the HiRISE instrument onboard the Mars Reconnaissance Orbiter currently circling Mars. The holes were originally identified on lower resolution images from the Mars Odyssey spacecraft, The above hole is about the size of a football field and is so deep that it is completely unilluminated by the Sun. Such holes and underground caves might be prime targets for future spacecraft, robots, and even the next generation of human interplanetary explorers.
Reply With Quote
  #6  
Old 28-05-2007, 06:00 PM
ispom's Avatar
ispom
admirer of the sky

ispom is offline
 
Join Date: Nov 2006
Location: Germany
Posts: 429
Todays APOD:

http://antwrp.gsfc.nasa.gov/apod/ap070528.html

a football-field-large hole on Mars, the entrance to a cave, in whose protection life exists? Shouldn't first Mars crew land there in the proximity?

Reply With Quote
  #7  
Old 28-05-2007, 06:05 PM
ispom's Avatar
ispom
admirer of the sky

ispom is offline
 
Join Date: Nov 2006
Location: Germany
Posts: 429
Quote:
Originally Posted by bojan View Post
It is not suffering form faulty operation of the brains ..
Simply, we are not getting enough information (both eyes are receiving the same image, no 3rd dimension info is present), so brain tries to interprete what's available, based on experience.
Try to rotate image 180 degrees, it works for me (sometimes) :-)
well, bojan, I've tried it and so it works !

rotate 180 degrees and enlarge,
and I'll see the landscape like in reality,
but if the picture rotates back,
the relief is wrong again
Reply With Quote
  #8  
Old 28-05-2007, 06:28 PM
Ric's Avatar
Ric
Support your local RFS

Ric is offline
 
Join Date: May 2006
Location: Wamboin NSW
Posts: 12,405
Tried rotating and it works a treat but I get dizzy standing on my head and it's to hard to type

Nice image though
Reply With Quote
  #9  
Old 28-05-2007, 09:43 PM
ispom's Avatar
ispom
admirer of the sky

ispom is offline
 
Join Date: Nov 2006
Location: Germany
Posts: 429
you must not rotate yourself, Ric
lets rotate the picture

you don't must diminish yourself to made the picture greater,
employ an image processing program
Reply With Quote
  #10  
Old 28-05-2007, 10:23 PM
bojan's Avatar
bojan
amateur

bojan is online now
 
Join Date: Jul 2006
Location: Mt Waverley, VIC
Posts: 7,113
Some more on this hole on Mars here:

http://planetary.org/blog/article/00000984
Reply With Quote
  #11  
Old 29-05-2007, 12:06 AM
Ric's Avatar
Ric
Support your local RFS

Ric is offline
 
Join Date: May 2006
Location: Wamboin NSW
Posts: 12,405
Methinks these holes are going to provide some fascinating discussion and speculation.

Cheers
Reply With Quote
  #12  
Old 29-05-2007, 12:25 AM
ballaratdragons's Avatar
ballaratdragons (Ken)
The 'DRAGON MAN'

ballaratdragons is offline
 
Join Date: Jan 2005
Location: In the Dark at Snake Valley, Victoria
Posts: 14,412
Wierd how the light seems to stop abruptly only a few metres into the hole, rather than showing a fading shadow dissappearing down a shaft. Its almost like the ground is only a shelf over a large cavernous area only a few metres under the shelf.
Reply With Quote
  #13  
Old 29-05-2007, 05:15 AM
glenc's Avatar
glenc (Glen)
star-hopper

glenc is offline
 
Join Date: Jun 2005
Location: Terranora
Posts: 4,406
Maybe someone painted the ground black!
Reply With Quote
  #14  
Old 29-05-2007, 10:07 AM
erick's Avatar
erick (Eric)
Starcatcher

erick is offline
 
Join Date: Dec 2006
Location: Gerringong
Posts: 8,548
Quote:
Originally Posted by ballaratdragons View Post
Wierd how the light seems to stop abruptly only a few metres into the hole, rather than showing a fading shadow dissappearing down a shaft. Its almost like the ground is only a shelf over a large cavernous area only a few metres under the shelf.
That's the conclusion they have come to - there is significant overhang - on the sunlit side, for sure. Go inot the article and pull up the highest resolution image - it's an amazingly black void!
Reply With Quote
  #15  
Old 29-05-2007, 03:16 PM
bojan's Avatar
bojan
amateur

bojan is online now
 
Join Date: Jul 2006
Location: Mt Waverley, VIC
Posts: 7,113
Quote:
Originally Posted by glenc View Post
Maybe someone painted the ground black!
If Richard Hoagland reads this....
Reply With Quote
  #16  
Old 29-05-2007, 03:19 PM
ballaratdragons's Avatar
ballaratdragons (Ken)
The 'DRAGON MAN'

ballaratdragons is offline
 
Join Date: Jan 2005
Location: In the Dark at Snake Valley, Victoria
Posts: 14,412
Quote:
Originally Posted by erick View Post
That's the conclusion they have come to - there is significant overhang - on the sunlit side, for sure. Go inot the article and pull up the highest resolution image - it's an amazingly black void!
I did Eric, that's where I noticed it the most.

I did a graphic to explain what I mean.
It seems to be like a shelved void (on the right) rather than a shaft (left)
Attached Thumbnails
Click for full-size image (Mars hole.jpg)
14.1 KB25 views
Reply With Quote
  #17  
Old 29-05-2007, 03:24 PM
erick's Avatar
erick (Eric)
Starcatcher

erick is offline
 
Join Date: Dec 2006
Location: Gerringong
Posts: 8,548
Quote:
Originally Posted by ballaratdragons View Post
I did Eric, that's where I noticed it the most.

I did a graphic to explain what I mean.
It seems to be like a shelved void (on the right) rather than a shaft (left)
Sorry Ken, I missed the point you made. I agree that the overhang must be substantial - any volunteers to stand near the edge? Let's hope the rovers (if they are still mobile?) don't encounter one - don't think they carry parachutes!
Reply With Quote
  #18  
Old 29-05-2007, 04:14 PM
ballaratdragons's Avatar
ballaratdragons (Ken)
The 'DRAGON MAN'

ballaratdragons is offline
 
Join Date: Jan 2005
Location: In the Dark at Snake Valley, Victoria
Posts: 14,412
Quote:
Originally Posted by erick View Post
Sorry Ken, I missed the point you made. I agree that the overhang must be substantial - any volunteers to stand near the edge? Let's hope the rovers (if they are still mobile?) don't encounter one - don't think they carry parachutes!
They may need to!
Attached Thumbnails
Click for full-size image (Mars hole.jpg)
14.9 KB39 views
Reply With Quote
  #19  
Old 29-05-2007, 04:18 PM
ving's Avatar
ving (David)
~Dust bunny breeder~

ving is offline
 
Join Date: Nov 2004
Location: The town of campbells
Posts: 12,359
hey, thats how it looks from my backyard!
Reply With Quote
  #20  
Old 29-05-2007, 05:27 PM
erick's Avatar
erick (Eric)
Starcatcher

erick is offline
 
Join Date: Dec 2006
Location: Gerringong
Posts: 8,548
Quote:
Originally Posted by ballaratdragons View Post
They may need to!
Cute, Ken!! I love your graphics! But the parachute has to be enormous - Mars Atmosphere is on average less than 1% of Earth's!
Reply With Quote
Reply

Bookmarks


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +10. The time is now 06:22 PM.

Powered by vBulletin Version 3.8.7 | Copyright ©2000 - 2025, Jelsoft Enterprises Ltd.
Advertisement
Bintel
Advertisement
Astrophotography Prize
Advertisement