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Jupiter moon shadows
A solar eclipse is rare on Earth, but this photo shows three occurring at the same time on Jupiter. In this Hubble image, three of Jupiter's 16 confirmed moons cast shadows that create black spots. From left to right, they are cast by Ganymede, Io and Callisto. Two of the moons are also visible in this image. Io is the white spot toward the center of the planet; Ganymede is the blue spot in the upper right. Callisto is outside the frame.
Probably the most spectacular missions of the U.S. space shuttle program involved repairing the Hubble Space Telescope. Launched into orbit in 1990, the Hubble was a bust due to a mirror that was out of focus.