Saturday, December 18, 2010
Updated: Io Over Jupiter's Terminator (and also a bit of historical perspective)
The next set is a comparison to show just how far planetary imaging has come. The top row shows the best images of the Jovian moons Io and Ganymede from the Pioneer mission in the early 1970s as they flew by Jupiter. The Pioneer probes were spin stabilized which (at least in those days) made it impossible for them to carry a true camera, so they had to scan line by line to build up an image.
The bottom row also shows images of Io and Ganymede, this time from the mid 2000s, taken by the Hubble Space Telescope. For comparison, please keep in mind that they don't show the same parts of each moon and the illumination angle is different, especially for Io. Still, the Hubble images, taken from low earth orbit, are far superior. How far we have come!
Processed Images Copyright Ted Stryk
Raw Voyager Data Courtesy NASA/JPL
Raw Pioneer Data Courtesy NASA/Ames
Raw Hubble Data Courtesy NASA/STScI