Last night, NASA's MESSENGER space probe finally went into orbit around the planet Mercury after a roundabout 6.5 year flight. It is the first probe to orbit the planet.
Since Mercury is always so close to the Sun, as seen from Earth, it has been difficult for astronomers to study historically. If all goes well, they will learn more about Mercury during the twelve months scheduled for the orbital phase of the mission than they have through all previous history.
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