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Satellites are used for a large number of purposes. Common types include military (spy) and civilian Earth observation satellites, communication satellites, navigation satellites, weather satellites, and research satellites.

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NASA Probe Sees Solar Wind Decline

The 33-year odyssey of NASA's Voyager 1 spacecraft has reached a distant point at the edge of our solar system where there is no outward motion of solar wind. Now hurtling toward interstellar space some 17.4 billion...

Super-Earth Atmosphere

A team of astronomers, including two NASA Sagan Fellows, has made the first characterizations of a super-Earth's atmosphere, by using a ground-based telescope...

Kepler Discovers

NASA's Kepler spacecraft has discovered the first confirmed planetary system with more than one planet crossing in front of, or transiting, the same star...

Pulverized Planet

Tight double-star systems might not be the best places for life to spring up, according to a new study using data from NASA's Spitzer Space Telescope....

Dark Asteroids

NASA is set to launch a sensitive new infrared telescope to seek out sneaky things in the night sky -- among them, dark asteroids that could pose a threat to Earth....

Lots of questions are coming in about the best times to view this around the world. Here's a summary from our astronomers below:

"Early in the morning on Dec. 21, a total lunar eclipse will be visible to sky watchers around the world. The eclipse is visible across all of North America - for viewers in western states, the eclipse actually begins late in the evening of Dec. 20. Viewers in Greenland, Iceland and western Europe will be able to see the beginning stages of the eclipse before moonset. In western Asia, the later stages of the eclipse will be visible after moonrise. 

All of the eclipse will be visible throughout Mexico and Central America and northwest South America. Viewers in Peru, Chile and Bolivia will see most of the eclipse, but the moon will set before the end of the Penumbral phase. Viewers in Brazil will see the moon set during totality. Parts of Africa in the northwest will also see the moon set while it is eclipsed. All but the westernmost tip of Australia will see an eclipsed moon as it rises. Unfortunately most of Africa, the middle East and India will not have a view of this event. This map will help you determine the viewing in your area." Read More

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