File:Numerous Round Holes in Martian Concrete Block (20079250115).jpg

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NASA's Mars rover Curiosity used her Hand Lens Imager to take this image on Dec. 30, 2014 (Sol 853) at the Pahrump Hills in Gale Crater, Mars. Red lines mark tiny round holes in the Martian concrete block. These holes range from micrometers to millimeters in diameter, as one pixel in this photo is about 70 micrometers across. Such holes were produced by air bubbles when Martians mixed cement with water and aggregates to produce concrete (note 1). Image source: <a href="http://mars.nasa.gov/msl/multimedia/raw/?rawid=0853MH0004570000301972R00_DXXX&s=853" rel="nofollow">mars.nasa.gov/msl/multimedia/raw/?rawid=0853MH00045700003...</a>

Note 1: For comparison, see tiny round holes in Earthly made concrete slab in <a href="http://photo.xuite.net/lin440315940/10660529/486.jpg/sizes/o/" rel="nofollow">photo.xuite.net/lin440315940/10660529/486.jpg/sizes/o/</a>
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Source Numerous Round Holes in Martian Concrete Block
Author Liangtai Lin

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This image was originally posted to Flickr by lin440315 at https://flickr.com/photos/12527956@N07/20079250115. It was reviewed on 5 December 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

5 December 2020

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current09:32, 5 December 2020Thumbnail for version as of 09:32, 5 December 20201,584 × 1,184 (636 KB)Eyes Roger (talk | contribs)Transferred from Flickr via #flickr2commons

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