[SKRIVA] Satellit kring Merkurius
- From: Ahrvid Engholm <ahrvid@xxxxxxxxxxx>
- To: <skriva@xxxxxxxxxxxxx>, <sverifandom@xxxxxxxxxxxxxxxxxxxx>
- Date: Fri, 18 Mar 2011 10:50:38 +0100
Rymdsonen Messenger, uppsjuten av NASA för 6,5 år sedan, har nu efter en serie
delikata manövrar parkerat i omloppsbana kring Merkurius:
http://www.nytimes.com/aponline/2011/03/17/science/AP-US-SCI-Mercury.html?_r=1&hpw
"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.
In the 1970s, NASA sent a spacecraft, Mariner, whizzing by Mercury, but only
got pictures of less than half of the tiny rock.
Det är den femte planeten i solsystemet (utanför jord-mån-systemet) som NASA
lyckats placera en sond i omloppsbana kring.
--Ahrvid
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