May 23, 2007, HiRISE release |
May 23, 2007, HiRISE release |
Guest_AlexBlackwell_* |
![]()
Post
#1
|
Guests ![]() |
|
|
|
![]() |
![]()
Post
#2
|
|
Founder ![]() ![]() ![]() ![]() Group: Chairman Posts: 14433 Joined: 8-February 04 Member No.: 1 ![]() |
Because the ceiling is overhanging. It's a collapse to a lava tube. We've seen other hirise images that take this to the extreme just leaving a single piece over the top of the old lava tube - itself with overhanging edges (the 'bridge' picture). The mechanism behind a formation like this is certainly not that unusual and indeed terrestrial analogues are not uncommon either.
http://www.texasbeyondhistory.net/plateaus/images/ap17.html We're looking almost straight down it - so in actual fact it wouldn't take that much of an overhang to mean we don't see the sides even if they're lit. That opening is 11,000 sq m . If there were 11,000 sq m of an unusual liquid - CRISM would have found it and we'd know about it. It's 8 or so Crism pixels across. Doug |
|
|
![]() ![]() |
![]() |
Lo-Fi Version | Time is now: 24th June 2024 - 08:08 AM |
RULES AND GUIDELINES Please read the Forum Rules and Guidelines before posting. IMAGE COPYRIGHT |
OPINIONS AND MODERATION Opinions expressed on UnmannedSpaceflight.com are those of the individual posters and do not necessarily reflect the opinions of UnmannedSpaceflight.com or The Planetary Society. The all-volunteer UnmannedSpaceflight.com moderation team is wholly independent of The Planetary Society. The Planetary Society has no influence over decisions made by the UnmannedSpaceflight.com moderators. |
SUPPORT THE FORUM Unmannedspaceflight.com is funded by the Planetary Society. Please consider supporting our work and many other projects by donating to the Society or becoming a member. |
![]() |