I see it

Space/Science » in reply to A natural arch on Mars!!

I see it

Robert — 12/26/2006 6:44:15 PM (archived)

I loved all the speculation about whether it's an optical illusion. Illumination is from the west (left), there are no craters--just hills--and the major feature is a trench, very likely a collapsed lava tube. The part in the middle didn't collapse, and the void underneath likely goes all the way through--making it a natural arch.

Good eye, Raoul, and I wouldn't bet against the eyes of an experienced observer. Besides, the official text describes it as a bridge: "One tiny remnant of lava tube roof has been left behind as a 25-meter-wide bridge, a natural arch over the trough below."

The whole thread (33 posts)

A natural arch on Mars!! - Raoul - 12/25/2006 8:18:22 PM
- another bridge from Viking - Greg - 12/28/2006 8:00:47 AM
  - Your Crater - nick hoffman - 12/31/2006 5:02:56 AM
    - re: Your Crater - Greg - 1/4/2007 5:00:28 AM
  - Not easy for the untrained eye... - McFly - 12/28/2006 5:54:32 PM
    - re: Not easy for the untrained eye... - Greg - 12/29/2006 11:27:14 AM
      - Actually more complex - nick hoffman - 12/29/2006 1:20:52 PM
        
        re: Actually more complex - Greg - 12/30/2006 1:52:13 PM
- So assuming it is not filled in, underneath... - alcaray - 12/27/2006 5:02:30 PM
- Extraordinary! - Scott Evil - 12/27/2006 2:50:04 PM
- I see it - Robert - 12/26/2006 6:44:15 PM
  - re: I see it (sorry, I went a bit off-topic in my response) - Michael Gmirkin - 1/3/2007 10:55:33 PM
    - re: I see it - Robert - 1/4/2007 12:42:09 AM
      - "alluvial" fan - nick hoffman - 1/4/2007 2:27:15 AM
        
        re: "alluvial" fan - Robert - 1/4/2007 5:23:26 PM
  - Mass hysteria. - Bowser - 12/27/2006 3:50:25 AM
    - The trick is... - nick hoffman - 12/27/2006 8:37:36 AM
      - Thanks. - Bowser - 12/28/2006 3:08:48 AM
  - *blush* - TB - 12/27/2006 12:31:02 AM
    - re: *blush* - Robert - 12/27/2006 5:36:18 PM
      - Bridge - TB - 12/28/2006 7:12:14 AM
- May be an optical illusion - TB - 12/26/2006 12:32:26 AM
  - Try rotating the image. - Robert Clark - 12/26/2006 6:35:41 PM
  - It's a gully - illumination from the West. - Doug Ellison - 12/26/2006 10:24:39 AM
  - Confusing - RobVG - 12/26/2006 1:40:49 AM
    - Unless those aren't craters? (n/t) - RobVG - 12/26/2006 1:43:52 AM
- (3.5 MB) enlarged picture - Raoul - 12/25/2006 8:28:27 PM
  - Seems a stretch - Bowser - 12/25/2006 11:18:50 PM
    - re: I don't think there are visible craters (n/t) - Raoul - 12/26/2006 6:41:35 AM
    - re: Seems a stretch - Fox - 12/26/2006 2:21:11 AM
      - that puts it in perspective - literally - Daniel - 12/27/2006 3:18:13 AM
      - Ahso! (n/t) - Rob - 12/26/2006 3:15:40 AM
        
        I wonder if it can be driven or walked upon? - LJK - 12/27/2006 5:02:39 AM

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