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May 23, 2007, HiRISE release
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post May 23 2007, 07:48 PM
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QUOTE (AlexBlackwell @ May 23 2007, 12:24 PM) *
The excitement in this thread is one thing. Just wait till the kooks get wind of this image.


(groan)...don't remind me. I'm traveling now, but next week one of my consipiracy-minded co-workers is going to jump me on this for sure if it hits Hoaxland...at least he's retiring soon!


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post May 23 2007, 07:54 PM
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QUOTE (nprev @ May 23 2007, 09:48 AM) *
(groan)...don't remind me. I'm traveling now, but next week one of my consipiracy-minded co-workers is going to jump me on this for sure if it hits Hoaxland...at least he's retiring soon!

Who? Your co-worker or Hoagland? biggrin.gif
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post May 23 2007, 08:08 PM
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The former; maybe he's tight enough with the latter to persuade him to follow suit? </wishful thinking mode> smile.gif


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djellison
post May 23 2007, 08:21 PM
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38 degrees. Call it 130m across - sohcahtoa and all that - 101 metres is the cutoff at which we wouldn't see light at the bottom.

Doug
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elakdawalla
post May 23 2007, 08:22 PM
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According to the caption on the image, though, HiRISE should be able to see deeper than that:
QUOTE
The pit must be very deep to prevent detection of the floor from skylight, which is quite bright on Mars.


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elakdawalla
post May 23 2007, 08:41 PM
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Just for grins, I went to HRSCview and located the HRSC image that contains this skylight. Here's a crop from that:
Attached Image

I also noticed another skylight in the same HRSC view:
Attached Image

It doesn't look to me like that one's on the Cushing et al list (see my blog entry for that list and image). Or is it?

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post May 23 2007, 08:53 PM
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Nice find, Emily! Seems like it's right in line with that (apparent) collapsed lava tube to the upper right...


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Juramike
post May 23 2007, 10:06 PM
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QUOTE (ngunn @ May 23 2007, 12:12 PM) *
Well, just look at that great big hole in the ground !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!



Ouch!

Am I the only one that didn't immediately see the pun??


GROAAAAAAAN! wacko.gif


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tuvas
post May 23 2007, 10:36 PM
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Ahh, they finally released this picture. The one's got all of the scientists perplexed, we've come to a conclusion it's likely an overhanging of some kind, meaning that the lava tube is really big... I think we've figured it must be at least 200 m deep as well. Still, it's certainly quite a mystery.

Oh, for those of you wanting to overlay MOLA data, it's already been tried, without any luck.
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ElkGroveDan
post May 23 2007, 11:34 PM
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QUOTE (tuvas @ May 23 2007, 02:36 PM) *
Oh, for those of you wanting to overlay MOLA data, it's already been tried, without any luck.


Were any THEMIS images taken?


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tuvas
post May 23 2007, 11:35 PM
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QUOTE (ElkGroveDan @ May 23 2007, 04:34 PM) *
Were any THEMIS images taken?


Of course, that's what prompted us to take the picture in the first place. Besides, THEMIS has photographed just about everywhere on Mars.
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ElkGroveDan
post May 23 2007, 11:38 PM
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OK now I see the history of this with Odyssey. Sorry been out of the loop with assorted obligations the past few months.

QUOTE (tuvas @ May 23 2007, 03:35 PM) *
Besides, THEMIS has photographed just about everywhere on Mars.


Good to know. Mike has yet to impliment the Midnight THEMIS Browser wink.gif , so I haven't been able to keep up on that instrument either.


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dvandorn
post May 23 2007, 11:48 PM
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Looks like a good landing site for MSL -- if it stood for the Mars Spelunking Laboratory... biggrin.gif

-the other Doug


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antipode
post May 24 2007, 12:06 AM
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Martian bungee jumping anyone? blink.gif

Surely this will kick off a more systematic look at the slopes of the Tharsis and Elysium volcanoes, if it isnt already happening. Who know how many of these things might turn up, and who knows how big they might be? Hmmmmm, 0.38 gravity.....

P
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antipode
post May 24 2007, 02:08 AM
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Actally, regardless of how deep these things are, at SOME time of the day at SOME time of the year (given their near equatorial location, around local mid day and around the equinoxes) the sun will illuminate the floors of these caverns. Being lucky enough to have an MRO overpass at one of these short periods is another matter of course...

P
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