File:Lunar Hole In One! (4627171262).jpg
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DescriptionLunar Hole In One! (4627171262).jpg |
English: A house-sized boulder (10 m diameter) rolled down-hill, scoring a hole in one (~60 m diameter crater)! Portion of LROC NAC M122597190L, image width is 500 m across. This scene is located within an approximately 7 km diameter crater that is inside the much larger, ~42 km diameter complex crater Henry Frères.
Golf-enthusiasts might look at today's image and say, "Wow, that boulder sure looks like a hole in one!" Boulders like this are incredible because we can determine where the boulder came from by back-tracking along the boulder trail. In fact, Apollo 17 Astronauts Schmitt and Cernan sampled a large boulder at Station 6, and because scientists were able to trace the original position of this boulder using its boulder trail, we can infer what the composition of the rocks up-slope may be. In this case, the boulder trail curves abruptly as the boulder approached its final resting place. What might have caused this boulder to deviate from its straight, downward course? You can see the boulder trail intersects a crater rim as the local slope was flattening out. As the boulder was slowing, it encountered a new steep slope on its right, thus turning it into the crater. Boulders fall from high elevations to lower ones because of gravity after being knocked loose by small impacts or moonquakes. Changes in slope can stop boulders; when a steep slope (like that of a crater wall) suddenly shallows, the boulder may not have enough inertia to continue moving. Inertia, or Newton's First Law of Motion, describes an object's resistance to change in velocity. So, a boulder will continue to move until something changes its speed or direction. |
Date | (released) |
Source | Lunar Hole In One!; see also https://www.nasa.gov/mission_pages/LRO/multimedia/lroimages/20100520_holeinone.html |
Author | NASA/GSFC/Arizona State University |
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Public domainPublic domainfalsefalse |
This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.) | ||
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This image was originally posted to Flickr by NASA Goddard Photo and Video at https://flickr.com/photos/24662369@N07/4627171262 (archive). It was reviewed on 11 May 2018 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
11 May 2018
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current | 23:52, 11 May 2018 | 1,000 × 1,000 (99 KB) | OceanAtoll (talk | contribs) | Transferred from Flickr via #flickr2commons |
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