17 January 2016

Stars out of focus show their true colors


This photo posted by NASA at APOD reminds us that stars have colors.
Captured in June from the north rim of the Grand Canyon of planet Earth, the shallow, close focus image has rendered pine needles on the tree branch sharp, but blurred the distant stars, their light smeared into remarkably colorful disks. Of course, temperature determines the color of a star. Most of the out-of-focus bright stars of Scorpius show a predominately blue hue, their surface temperatures much hotter than the Sun's. Cooler and larger than the Sun, and noticably redder on the scene, is giant star Antares at the heart of the scorpion. In focused, telescopic views the whitish disk at the upper right would be immediately recognizable though, reflecting the Sun's light as ringed gas giant Saturn.

3 comments:

  1. great photo tip! i will have to try that on the next clear night. that is warm. meaning like in may or june, at the earliest.

    I-)

    ReplyDelete
  2. What a beautiful photo.

    ReplyDelete
  3. if you have a point and shoot camera, and it is night time, and it is dark (meaning no street lights), and it is snowing, turn on the camera, turn on the flash so it will fire, point the camera up into the sky, and take a picture. when you look at the picture in your photo editing app, and you zoom in, quite often the snowflakes look like nebulas and stars, a la deep space hubble images.

    I-)

    ReplyDelete

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