NASAのインスタグラム(nasa) - 4月9日 07時56分

What's the bright spot of light seen in this image from our Curiosity Mars Rover? The sun is in the same direction, west-northwest, above the frame. Bright spots appear in images from the rover nearly every week. One possible explanation for the bright spot in this image is a glint from a rock surface reflecting the sun. Another is a cosmic ray hitting the camera's light detector, a CCD (charge-coupled device). Cosmic ray patterns in Mars rover images vary from a dot to a long line depending on the angle at which the ray strikes the detector.

The right-eye camera of the stereo Navcam recorded this frame during the afternoon of the 589th Martian day, or sol, of Curiosity's work on Mars (April 3, 2014), from the site where the rover reached a waypoint called "the Kimberley" by that sol's drive. An image taken by the Navcam's left-eye camera within one second of the same does not include a bright spot of this type. A pair of Navcam images in the same direction from the previous afternoon has a bright spot similarly located in the right-eye image but not in the left-eye image.

Credit: NASA/JPL-Caltech

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