U.S. scientists say they have determined so-called pedestal craters, a subclass of impact craters unique to Mars, might have resulted from climate changes.
UPI Almanac for Thursday, April 3, 2008.
UPI almanac for Tuesday, April 3, 2007.
Today is Monday, April 3, the 93rd day of 2006 with 272 to follow.
Today is Sunday, April 3, the 93rd day of 2005 with 272 to follow.
Today is Saturday, April 3, the 94th day of 2004 with 272 to follow.
Researchers said Wednesday the Mars Global Surveyor and Mars Odyssey spacecraft have detected evidence of a relatively recent ice age on Mars.
Today is Thursday, April 3, the 93rd day of 2003 with 272 to follow.
The Pony Express postal service began on this date in 1860 when the first riders left St. Joseph, Mo., heading west, and Sacramento, Calif., heading east. For $5 an ounce, letters were delivered within 10 days. The Pony Express lasted less than two years,
The weekly UPI Blast from the Past package for March 31-April 6.
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