Venus disc seen through a small telescope

Venus disc seen through a small telescope

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Credit: PEKKA PARVIAINEN/SCIENCE PHOTO LIBRARY

Caption: Image of the disc of Venus as seen through a small telescope, when the planet was close to the horizon. In this position the light coming from Venus must pass through an increasing mass of air: the refraction effects become significant and this produces the separation of colours visible here. Refraction is larger for blue and green light than for red light. As a result the blue image of the disc of Venus appears to be slightly higher above the horizon than the red image.

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Keywords: astronomy, atmosphere, colour separation, cosmology, light, light refraction, planet, planetary, refraction, science, venus, venus disc

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