Earth Seen from Mars - NASA JPL Image

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Discussion Overview

The discussion revolves around the appearance of Earth as seen from Mars, specifically in the context of a NASA JPL image. Participants explore the visual characteristics of the image, including color perception and the visibility of the Moon from Mars.

Discussion Character

  • Exploratory, Conceptual clarification, Debate/contested

Main Points Raised

  • Some participants express surprise that Earth does not appear more blueish in the image, given that Mars is perceived as red.
  • One participant suggests that Earth might look bluer to the naked eye due to color perception adjustments, comparing it to wearing red-tint sunglasses.
  • Another participant wonders if the Moon would be visible in the image, questioning its alignment with Earth and Mars.
  • It is noted that the Moon could be seen from Mars with the naked eye, but it would appear fainter and may not be captured in the short exposure taken by the Spirit rover.
  • A later reply proposes that the Moon might actually be visible in the image, pointing out a faint streak that could correspond to the Moon's position.
  • Participants discuss the implications of the image's exposure settings on the visibility of fainter celestial objects.

Areas of Agreement / Disagreement

Participants express various viewpoints regarding the color perception of Earth and the visibility of the Moon, indicating that multiple competing views remain without a consensus on these aspects.

Contextual Notes

The discussion includes assumptions about color perception and visibility that are not fully resolved, particularly regarding the effects of exposure settings on the image quality.

scott1
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http://www.jpl.nasa.gov/missions/mer/images.cfm?id=1685
I thought it would look more blueish since we see Mars as red.
 
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I wonder if it might look bluer to the naked eye. When I wear red-tint sunglasses, my eyes adjust and I can distinguish blues and other colors. But a photograph taken through my red sunglasses always keeps its red tint.

I hope I get to find out some day :)
 
I would have hoped you could see the Moon too - perhaps it is in alignment with Earth - Mars?

Garth
 
You could see the Moon from Mars with the naked eye; however, it would be several times fainter, and would not show up in the short exposure that Spirit took.
 
Romanus said:
You could see the Moon from Mars with the naked eye; however, it would be several times fainter, and would not show up in the short exposure that Spirit took.
That makes sense. And upon further review I think I can see the Moon in that picture. Look off to the 1 o'clock position for a much fainter streak that is parallel to the one made by Earth. The fact that no other stars are visible in the image implies that fainter objects are indeed squelched from the photo like you suggest.
 

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