Author Topic: TLP Project - Boulder Repellent  (Read 47344 times)

Caro

  • IOTW posters
  • Sr. Member
  • *
  • Posts: 341
Re: TLP Project - Boulder Repellent
« Reply #15 on: August 07, 2010, 07:26:32 am »



ID: AMZ4003h9h/AMZ4003hd4/AMZ4003h9i/AMZ4003hd5
Latitude: 30.8561°
Longitude: 22.4178°

Caro

  • IOTW posters
  • Sr. Member
  • *
  • Posts: 341
Re: TLP Project - Boulder Repellent
« Reply #16 on: August 13, 2010, 04:39:50 pm »


ID: AMZ4002tus
Latitude: 12.4851°
Longitude: 62.1912°

Caro

  • IOTW posters
  • Sr. Member
  • *
  • Posts: 341
Re: TLP Project - Boulder Repellent
« Reply #17 on: August 14, 2010, 07:34:23 am »


ID: AMZ4001gau
Latitude: 13.3196°
Longitude: 61.9981°

Tom128

  • IOTW posters
  • Hero Member
  • *
  • Posts: 677
Re: TLP Project - Boulder Repellent
« Reply #18 on: August 15, 2010, 05:58:46 am »
Here are two craters in same area, one with boulders mimicking boulder repellent and a second with most of the boulders ejected but having the mold so to speak that would form a boulder free bulls eye circle. Kind of like a sombrero hat pattern.

   

# ID: AMZ1002le6
# Latitude: 22.6521°
# Longitude: 25.3467°
# Sun Angle: -73.02

Level 3 zoom

NAC photo strip http://wms.lroc.asu.edu/lroc/view_lroc/LRO-L-LROC-2-EDR-V1.0/M113792328LE




The photo strip has quite a few examples to look at.  Below is another bench crater full of boulders:




Looking closer you can see a smaller open center.  So, my thought is that the bench crater form is creating the boulder repellent look and the quantity, type, size and form of boulders filling the crater mold directly affect the inner bulls eye- empty center circle, at least in many cases  :)

 

 
« Last Edit: August 15, 2010, 07:03:55 pm by Tom128 »

Aliko

  • Full Member
  • ***
  • Posts: 148
Re: TLP Project - Boulder Repellent
« Reply #19 on: August 24, 2010, 10:31:52 pm »

# ID: AMZ10011uk
# Latitude: 12.7032°
# Longitude: 62.4688°

Caro

  • IOTW posters
  • Sr. Member
  • *
  • Posts: 341
Re: TLP Project - Boulder Repellent
« Reply #20 on: September 19, 2010, 11:23:41 am »


ID: AMZ400186o
Latitude: -3.79624°
Longitude: 336.279°

khearn

  • Newbie
  • *
  • Posts: 1
Re: TLP Project - Boulder Repellent
« Reply #21 on: September 22, 2010, 03:52:48 am »
Any chance that the first crater in the thread might be volcanic instead of impact? It looks too fresh to be volcanic, but the shape looks somewhat volcanic. Have we ever found evidence of recent volcanism on the Moon? I know they were hoping that Shorty crater was recent, but turned out otherwise, but I'm not sure if anything has actually been found or if they've pretty much concluded that there hasn't been any volcanism for a few billion years.

   Keith

Geoff

  • Global Moderator
  • Hero Member
  • *****
  • Posts: 2143
  • The history of astronomy is a history of receding horizons. - Hubble.
Re: TLP Project - Boulder Repellent
« Reply #22 on: September 22, 2010, 07:23:55 am »
Hi Keith

Don't know if the ray crater in the first post is volcanic or not - will have to research it. I put this thread together using input from Anthony Cook so don't know all the details.

Some areas on the Moon are thought to be volcanic in origin although the last activity was probably about a billion years ago.

See this thread for information on the Hyginus crater region: http://forum.moonzoo.org/index.php?topic=173.0

And here's an article about late volcanism on the Moon: http://www.space.com/scienceastronomy/081106-moon-volcanoes.html

Tom128

  • IOTW posters
  • Hero Member
  • *
  • Posts: 677
Re: TLP Project - Boulder Repellent
« Reply #23 on: September 30, 2010, 03:43:42 am »
Zooming out from the crater example Geoff posted for boulder repellent, you see one incredible site to behold.  Notice how the ejecta streamers extend well up the strip cutting twisting grooves and interesting designs in the regolith.  Best seen when at max magnification.



Above this one toward the top of the photo strip is a similar molded crater shown without boulders that, in my view, would form the same boulder repellent design if they were present.  Wonder if NASA will shuttle us up there to refill the crater with boulders to see if its true  :)



« Last Edit: September 30, 2010, 02:44:22 pm by Tom128 »

astrostu

  • Sr. Member
  • ****
  • Posts: 359
Re: TLP Project - Boulder Repellent
« Reply #24 on: September 30, 2010, 06:05:31 am »
Any chance that the first crater in the thread might be volcanic instead of impact? It looks too fresh to be volcanic, but the shape looks somewhat volcanic. Have we ever found evidence of recent volcanism on the Moon? I know they were hoping that Shorty crater was recent, but turned out otherwise, but I'm not sure if anything has actually been found or if they've pretty much concluded that there hasn't been any volcanism for a few billion years.

   Keith

I'm not entirely sure what the current thinking is on recent volcanism, to the best of my knowledge the youngest volcanic rocks are dated to over a billion years.  While that's in the last fifth of lunar history, few would consider that "recent," I think.

In terms of the crater in question, it does not look to have any volcanic features to me.  As a broad rule of thumb, rayed craters on the moon are generally ~1-2 billion years or younger, and this one in particular looks very fresh.  The central clear part of the floor looks very interesting and has some apparent cracks or grooves, but my initial inclination is that it is unlikely to be volcanic.

Of other interest, there appear to be quite a few bench craters around that main rayed crater.

ElisabethB

  • IOTW posters
  • Sr. Member
  • *
  • Posts: 494
Re: TLP Project - Boulder Repellent
« Reply #25 on: October 07, 2010, 05:59:53 pm »

AMZ400383h
Latitude: 16.2561°
Longitude: 46.493°

Geoff

  • Global Moderator
  • Hero Member
  • *****
  • Posts: 2143
  • The history of astronomy is a history of receding horizons. - Hubble.
Re: TLP Project - Boulder Repellent
« Reply #26 on: October 08, 2010, 05:24:42 pm »
This looks like the same crater that Caro found in reply #15 but from a different strip:


ID: AMZ1002qx8
Latitude: 30.7572°
Longitude: 22.3362°

This is the zoomed-out image:


« Last Edit: October 08, 2010, 05:26:29 pm by Geoff »

mart.vader

  • Newbie
  • *
  • Posts: 17
Re: TLP Project - Boulder Repellent
« Reply #27 on: October 23, 2010, 07:44:08 pm »
Boulder Repellent?

ID: AMZ10039ju
Latitude: 11.2464°
Longitude: 311.336°
Sun Angle: -82.77°




claymore

  • Full Member
  • ***
  • Posts: 246
Re: TLP Project - Boulder Repellent
« Reply #28 on: October 29, 2010, 06:39:32 am »



# ID: AMZ4003e6p
# Latitude: 21.5328°
# Longitude: 24.2716°
# ID: AMZ4003ead
# Latitude: 21.5401°
# Longitude: 24.2656°

jules

  • Global Moderator
  • Hero Member
  • *****
  • Posts: 3478
Re: TLP Project - Boulder Repellent
« Reply #29 on: November 12, 2010, 09:30:33 pm »
For those looking for the Apollo 15 / LROC crater matching discussion it now has it's own thread.