Spiral Galaxy with Differential Rotation

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Uploaded by on Jan 2, 2009

Raw elements were generated in Celestia, then composited into Ulead VideoStudio.

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Science & Technology

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Standard YouTube License

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Uploader Comments (theropod)

  • How can you make a spiral galaxy rotate in celestia?

  • Good question. Answer: I cheated. I pulled back the camera POV high above the galaxy's plane. Then, making sure there wasn't anything in the background, I HELD DOWN THE ARROW KEY for the duration of my video recording to spin the camera's POV and create the ILLUSION that the galaxy was rotating.

    To make differential rotation, I overlaid two versions of the same video clip with appropriate opacities, and played back the smaller inner clip at double speed.

  • do galaxys turn clockwise as well?

  • All spiral galaxies do. It just depends on whether you're looking at it from above, or below.

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All Comments (7)

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  • Really interesting.

    Good work.

  • Sorry but at the end I expected a huge zombie face to pop up and yell AAAAAGGGGGHHHHH!

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