Daily Extra :
Crater Density: The number of craters on a surface per unit area.
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Today in History:
1971: Apollo 14 - USA Lunar Manned Lander (January 31 to February 8, 1971) Crew: Alan B. Shepard, Jr., Edgar D. Mitchell, Stuart A. Roosa. Shepard and Mitchell landed on the moon on February 5, 1971, in the Fra Mauro highlands, located at 3°40' S and longitude 17°28' E. They collected 42.9 kilograms of lunar samples and used a hand-held cart to transport rocks and equipment.
1977: Burn up of Salyut 4 Space Station (U.S.S.R.)
1995: U.S. space shuttle Discovery launched