The Week in SpaceApril 13-19, 2009
Constant Satellite, Ephemeral Lake Landsat 7, the latest member of the Landsat program, was launched ten years ago this week. The Landsat program, managed jointly by NASA and the U.S. Geological Survey, began in 1972 as the Earth Resources Technology Satellite program, and it represents the longest high-resolution multispectral record of Earth’s continental surfaces as seen from space. Landsat 7’s imager is the Enhanced Thematic Mapper Plus, which measures solar radiation reflected from Earth’s surface in eight different wavelengths. This stunning false-color image of Lake Carnegie in Western Australia was taken in Landsat 7’s first year of service. Lake Carnegie fills with water only during periods of significant rainfall; during dry years, the lake is reduced to a muddy marsh. Image credit: USGS National Center for EROS and NASA Landsat Project Science Office
Weekly CalendarApril 13-19, 2009 Holidays - Sky Events - Space History
|
Customer Comment
I have ordered the calendar every year since 2001 and love each one. The pictures are outstanding and I have kept each one. Thanks for creating such a great product.--Robert W., Franklin, MI
Monday 13 
Tuesday 14
Wednesday 15
Thursday 16
Friday 17
Saturday 18
Sunday 19
Suggestions for new history dates or better links? Corrections for errors on this page? Please e-mail me.