surprises for scientists studying the solar system's innermost planet.
MESSENGER (MErcury Surface, Space ENvironment, GEochemistry and
Ranging) made its first flyby of Mercury earlier this month, sending
back images of previously unseen features including huge cliffs and
"The Spider" - a formation of more than 100 narrow troughs radiating
from a central region.
The craft has also revealed that the Caloris basin - a massive impact
crater - is around 960 miles (1540km) in diameter, rather than the 800
miles (1290km) estimated by the Mariner 10 mission in the mid 1970s.
"This flyby allowed us to see a part of the planet never before viewed
by spacecraft, and our little craft has returned a gold mine of
exciting data," said Sean Solomon, MESSENGER's principal investigator,
Carnegie Institution of Washington.
Instruments on the probe have provided new information about Mercury's
magnetic field and surface composition.
MESSENGER will make two more flybys of Mercury before it settles into
orbit in 2011.
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