Daily Extra :
compression: A packing or reduction in the amount of data being transmitted, using a mathematical formula similar to averaging, in order to optimize the transmission of data from the spacecraft. Once received, these data are "unpacked" (decompressed) to reconstruct the full image. However, if noise (see Radiation) is present it may cause incorrect values for the picture elements it was averaged with, which also affects the resulting image.
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Today in History:
1958: 4751st Air Defense Missile Wing to develop and conduct training program for Bomarc units, and the 864th Strategic Missile Squadron to be equipped with Jupiter IRBM, were both activated.
1973: Luna 21 lands on the Moon, carrying the Lunokhod 2 rover, the second robotic lunar rover.
1976: US-German Helios B solar probe launched into solar orbit
1997: Space Shuttle Atlantis docks with Mir Space Station
1998: NASA announces John Glenn, 76, may fly in space again
2006: Stardust space mission returns dust from a comet to earth