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    ISS031 star trail created with iss031e065837 thru iss031e065937

    poorpoor, Ubante, bior, and 135 other people added this photo to their favorites.

    1. lambertpix 22 months ago | reply

      What a remarkable series. Thanks for sharing.

    2. Mark Chance Photography 22 months ago | reply

      that's amazing. What are the blue flashes? Lightning?

    3. pc0101 22 months ago | reply

      Yes, these are lightnings.

    4. pc0101 22 months ago | reply

      The colourful streaks on Earth are city lights at night. At short exposures they are dots, but in such long exposures of 15 seconds and more (and even combined with subsequent by means of "stacking") they turn into long streaks. The colours are due to the different types of lamps used for the illumination of the city. The green line on the horizon is not an aurora but normal airglow caused by chemical reactions and physical discharging processes in the high atmosphere (the distinct line is about 60 to 70 km above Earth's surface).

    5. pc0101 22 months ago | reply

      The explanation of how such shots are made, in Don Pettit's own words:
      ”My star trail images are made by taking a time exposure of about 10 to 15 minutes,” said Pettit. “However, with modern digital cameras, 30 seconds is about the longest exposure possible, due to electronic detector noise effectively snowing out the image. To achieve the longer exposures I do what many amateur astronomers do. I take multiple 30-second exposures, then ‘stack’ them using imaging software, thus producing the longer exposure.”

    6. GOR44Photographic 22 months ago | reply

      How brilliant, luv it

    7. Refractor-Phill 22 months ago | reply

      Which camera was used?
      Canon EOS, Nikon D3, Hasselblad, other... ?

    8. Fillbe 21 months ago | reply

      that's one good tripod.

    9. Tims ProSkateShots 20 months ago | reply

      This is truly wonderful!!

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