As you probably know, stars can come in different colors, from the cooler, redder stars, to the hottest blue and white stars.

It's hard to see the difference in color, but you can really see it in a star trail image like this one, taken by Mary Spicer.

Mary used her Canon 1100D with an 18-55 mm lens and wide angle attachment. She took 30 second exposures for 3 hours, collecting all the data to be able to create this star trail images.

To build the final image, she used StarStaX and the cleaned everything up in Adobe Lightroom.

Here's a link to the original image:
https://www.flickr.com/…/spicey_…/24016961709/in/dateposted/
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