Digital Photography Hacks

Colorful Star Trails

For most people, stars are decorative points of light that decorate the night sky. But for you, they can also be fascinating streaks of light that add dazzle to your compositions.

Stars might appear as twinkling points of light to the naked eye, but when you point a camera at them and leave the shutter open for a while, they transform into colorful streaks across the sky. Photographing star trails is not only an artistic endeavor; it can also provide insight into the nature of stars themselves.

Stars are basically composed of hydrogen and helium, and they burn intensely. The hotter the star is, the more bluish its color, and cooler stars tend to be reddish orange. Based on this information, scientists have formed theories about the age of the stars we observe. A bright blue star, for example, is considered at the peak of its life. A duller red star, on the other hand, is much older.

Thinking about the age of a particular star on a chilly night probably demands more commitment than the average person cares to allocate to such matters. But if you point your digital camera upward and let it record trails of those stars, their colors are much easier to distinguish in the comfort of your home, gazing at your computer screen, than they are when you gaze upward into the frigid night.

Take a look at the picture of Orion’s belt and sword in Figure 3-18 (the constellation Orion the Hunter dominates the winter sky in the Northern Hemisphere). This image is a four-second ...