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stary skies only on Earth?

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  • stary skies only on Earth?

    Ever notice how stars are visible in our night sky but not when your on the moon?!
    I guess the light reflects on our atmosphere and other places there where there is no atmosphere you just don't see whats not there any more.
    Because when we look up at our sky aren't we seeing stars that have already died out?


  • #2
    This is why:

    The truth is, the lunar landscape is so bright that the camera exposure settings to take a good lunar landscape photo are not sensitive enough to image the much (much Much MUCH) fainter stars that are in the lunar sky. If the camera was set to record the stars, the moonscape would be washed out white and featureless.

    The link also shows it via photos.

    From wikipedia:

    * Stars are also never seen in Space Shuttle, Mir, International Space Station Earth observation photos, or even sporting events that take place at night. The sun in the Earth/Moon area shines as brightly as on a clear noon day on Earth, so cameras used for imaging these things are set for daylight exposure, with quick shutter speeds in order to prevent overexposing the film. The dim light of the stars simply does not have a chance to expose the film. (This effect can be demonstrated on Earth by attempting to view stars from a brightly lit parking lot. You can only see them if you somehow block out all illuminated objects from your field of view, and then let your eyes adjust for night vision. Otherwise, it is like taking a picture of the night sky with exposure settings for a bright sunny day. Science fiction movies and television shows do confuse this issue by depicting stars as visible in space under all lighting conditions.) Stars were seen by every Apollo mission crew except for the unfortunate Apollo 13 (they couldn't see the stars due to the fact that oxygen and water vapor created a haze around the spacecraft). Stars were used for navigation purposes and were occasionally also seen through cabin windows when the conditions allowed. To see stars, nothing lit by sunlight could be in the viewer's field of view. (Plait 2002:158-60).

    * Stars are not dramatically brighter in space (above the Earth's atmosphere). Professional astronomer and two-time space shuttle astronaut Ronald A. Parise stated that he could barely see stars at all from space. He had to turn out all of the lights in the shuttle to even glimpse the stars (Plait 2002:160). Even with cameras several times more sensitive than the ones used on Apollo, it takes an exposure of several seconds for even the brighter stars to show up.[3]

    * The ability to determine parallax is limited by the angular resolution of the instrument used. The most advanced dedicated experiment carried out to date—the Hipparcos satellite—achieved resolutions in the milliarcsecond range. Using as baseline the diameter of the Earth's orbit about the Sun (by comparing images taken six months apart), this allowed parallax measurements for stars out to a distance of approximately 1,000 parsecs. However, the distance from Earth to Moon is about a thousand times smaller than that baseline, which means that the detection limit is reduced to about 1 parsec. This is less than the distance to the nearest star, Alpha Centauri. Considering further that the resolution of an image taken with a conventional camera is many times lower than Hipparcos's, any such determination is entirely ruled out.[citation needed]
    Also read:
    Why Can't Stars Be Seen In Moon, Space Photos?
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