United States Virginia change
Sri Lanka Breaking News
Sri Lanka parliament
vivalankaSri Lanka newsSri Lanka businessSri Lanka sportsSri Lanka technologySri Lanka travelSri Lanka videosSri Lanka eventssinhala newstamil newsSri Lanka business directory
vivalanka advertising
Stay Connected
Popular Searches
T20 World Cup
Sponsored Links
Sri Lanka Explorer

NASA spacecraft now circling Mercury _ a first

Mar 18, 2011 4:26:00 AM - thestate.com
For the first time, Earth has a regular orbiting eye-in-the-sky spying on the solar system's smallest and strangest planet, Mercury.

NASA's spacecraft called Messenger successfully veered into a pinpoint orbit Thursday night after a 6 1/2-year trip and 4.9 billion miles and tricky maneuvering to fend off the gravitational pull of the sun. It is the fifth planet in our solar system that NASA has orbited, in addition to the Earth and the moon.

"It was right on the money," Messenger's chief engineer, Eric Finnegan, said. Messenger is in orbit that brings it as close as 120 miles above the planet's surface. "This is as close you can possibly get to being perfect."

"Everybody was whooping and hollering; we are elated," Finnegan said. "There's a lot of work left to be done, but we are there."

Mercury is not only difficult to get to, but it's has some of the most extremes in the solar system. Temperatures there swing wildly by 1,100 degrees. While it gets up to 800 degrees on the planet closest to the sun, it also is so cold and dark in some craters that the temperatures don't get above 300 degrees below zero. Radar even shows that there is likely frozen ice in those craters, something Messenger will try to confirm.

USA, South Carolina: (Latest Stories)