Results 1 to 5 of 5

Thread: Convex craters?

  1. #1
    Join Date
    May 2009
    Location
    42.798928,10.952804
    Posts
    447

    Convex craters?

    In moon photos like this



    at first I interpreted the image as displaying "convex craters", or flat hills :-? (light supposedly is coming from the left).

    But flattened hills like that look strange (and they have no geologic rationale).

    Hence I must suppose the opposite: the image displays the usual CONCAVE craters, and the light is coming from the RIGHT

    which explanation is the right one for you?

  2. #2
    Join Date
    Aug 2005
    Location
    NEOTP Atlanta, GA
    Posts
    2,792
    Turn the image upside down. Itís an optical illusion. Inverting the image changes the illusion.

  3. #3
    Join Date
    Sep 2004
    Posts
    3,199
    The feature is Maskelyne, thought to be volcanic. The irregular areas around the center cone are ejecta splatters or ancient lava, I assume.

    The central feature inside the "crater" (cone) seems to be a mesa, possibly from upwelling magma.

    https://scitechdaily.com/lunar-recon...nar-volcanism/

    https://earthsky.org/space/moon-saw-...y-recent-times

    Also, upside-down image making the scene clearer.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	16046547720_93a02d2272 flip.jpg 
Views:	28 
Size:	1.20 MB 
ID:	24452  
    Last edited by Roger E. Moore; 2019-Aug-01 at 03:31 PM. Reason: 2nd reference

  4. #4
    Join Date
    May 2009
    Location
    42.798928,10.952804
    Posts
    447
    i'm still undecided and i'm sitting on a fence



    those damn features that I call convex craters (for lack of a better term )

    A) look like mesas of SW USA (but HOW those strange mesas supposedly formed, in a world - the Moon - without wind or rain?!)

    or B) might be normal concave craters that appear convex to us (tsk tsk) for some nasty optical illusion...

    help me to decide

    Last edited by Barabino; 2019-Aug-11 at 07:57 AM.

  5. #5
    Join Date
    May 2009
    Location
    42.798928,10.952804
    Posts
    447
    up, up...

    Quote Originally Posted by Barabino
    or B) might be normal concave craters that appear convex to us (tsk tsk) for some nasty optical illusion...
    it's more an error in assessing the picture (guessing whether light comes from left or from right side), rather than a proper optical illusion...

    Last edited by Barabino; 2019-Aug-20 at 05:20 AM.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •