Pluto twice, raw data (smaller image) and processed data (larger image), from the Hubble Space Telescope.
Images of Pluto taken by the NASA Hubble Space Telescope with the ESA Faint Object Camera. These images, taken in late June and early July, 1994 are the first views which allow resolution of features on Pluto's surface. Opposite hemispheres are seen on the left and right. The large lower images are processed versions made from a number of Hubble observations. The smaller images at the top are actual raw images, each pixel is over 150 km across. The variations in brightness may be due to topographic features and/or surface composition, frost layers, and interactions with Pluto's nitrogen-methane atmosphere. Pluto is 2390 km in diameter and north is up. (HST, STScI-PR96-09a)
Modified slightly by working with GIMP, removing lines, and applying a Gaussian Blur to smooth out pixels in original image, to make it more "natural". It is this modification that is placed under GFDL. (Trivial to do yourself, but "original work" nevertheless.)
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The NASA website hosts a large number of images from the Soviet/Russian space agency, and other non-American space agencies. These are not necessarily in the public domain.
The SOHO (ESA & NASA) joint project implies that all materials created by its probe are copyrighted and require permission for commercial non-educational use. [2]
This file is in the public domain because it was created by NASA and ESA. NASA Hubble material (and ESA Hubble material prior to 2009) is copyright-free and may be freely used as in the public domain without fee, on the condition that only NASA, STScI, and/or ESA is credited as the source of the material. This license does not apply if ESA material created after 2008 or source material from other organizations is in use.