Francois Colas (astronomer at the observatory of Paris) and I took this picture of Mars with the 1-meter telescope at the Pic-du-Midi observatory. Images processed by Jean-Luc Dauvergne (Ciel&Espace magazine). The gif movie shows the rotation of the planet during 40 min. Plus two stereoscopic pairs showing Mars in 3D. One uses the cross-eyed technique: squint to merge the two globes into one at the center of the frame (a finger or any sharp object in front of your nose can help). The other uses the parallel technique (two rolls of paper or cardboard, held like binoculars, can help to direct each eye towards the corresponding globe: left eye for the left globe, right eye for the right globe).
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