This is a long exposure picture taken by a swinging camera. The swirl on the left is the alpha star in the constellation Leo, Regulus. The right one is the planet Mars. the reason Regulus' path varies in color and intensity is because atmospheric turbulence causes starlight to scintillate. This is commonly known as stars' twinkling. in the lower corners of the image, you can see the paths of two faint stars as well.
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