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That reminded of this article, http://petapixel.com/2012/09/13/1909-lincoln-penny-used-to-calibrate-the-mars-curiosity-rovers-camera-on-mars/ http://petapixel.c

That reminded of this article, http://petapixel.com/2012/09/13/1909-lincoln-penny-used-to-calibrate-the-mars-curiosity-rovers-camera-on-mars/ http://petapixel.com/2012/09/13/1909-lincoln-penny-used-to-c... "Coin" being used for camera calibration on rovers. Not sure if they can be used to show scale too.

kevinwang 12y ago
Funny that they chose the penny because it's classically used in geology to combat the issue of scale in photographs, which it seems is an issue in Mars too.
- bcbrown 12y ago
  That's exactly why it was chosen.
aidos 12y ago
An article about that was on HN just yesterday. https://news.ycombinator.com/item?id=8033760 https://news.ycombinator.com/item?id=8033760