December 2006 Calendar - Global Callisto in Color
NASA/JPL/ DLR(German Aerospace Center)Download full size image
Bright scars on a darker surface testify to a long history of impacts on Jupiter's moon Callisto in this image of Callisto from NASA's Galileo spacecraft. The picture, taken in May 2001, is the only complete global color image of Callisto obtained by Galileo, which began orbiting Jupiter in 1995. Of Jupiter's four largest moons, Callisto orbits farthest from the giant planet. Callisto's surface is uniformly cratered but is not uniform in color or brightness. Scientists believe the brighter areas are mainly ice and the darker areas are highly eroded, ice-poor material.
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Quote of the Day
Approximately 80% of our air pollution stems from hydrocarbons released by vegetation, so let's not go overboard in setting and enforcing tough emission standards from man-made sources. - Ronald Reagan (b. 1911), U.S. Republican politician, president.
Fact of the Day
Astronaut and moon-walker James Irwin's NASA name tag, coated with lunar dust, sold at auction for $310,500. The cloth keepsake, a 6- by 12-inch rectangle, was cut from the insulated jacket worn by Irwin during the 1971 flight of Apollo 15. Lunar dust, which created a dark gray tint around the tag's edges, became embedded into the tag during three separate moonwalks Irwin took. His jacket and other equipment were left on the Moon to lighten the spacecraft's load on the return trip home, but Irwin cut out and kept his NASA tag as a memento.Word of the Day
transuranic
Pronunciation: /trans-yoo-RAN-ik/
adj : of or designating those elements having atomic numbers higher than that of uranium
"Plutonium and other transuranic elements may seal the fate of the human race."
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