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MESSENGER reveals more of Mercury's hidden territory

Scientists have now seen about 95 percent of the innermost planet.
Provided by NASA Headquarters, Washington, D.C.
Mercury
This image of Mercury captured was by MESSENGER on the probe's second approach.
NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington
October 29, 2008
A NASA spacecraft gliding over Mercury's battered surface for the second time this year revealed more previously unseen real estate on the innermost planet.

The probe also produced several science firsts and is returning hundreds of new photos and measurements of the planet's surface, atmosphere, and magnetic field.

The MErcury Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER) spacecraft flew by Mercury shortly after 4:40 A.M. EDT, October 6. It completed a critical gravity assist to keep it on course to orbit Mercury in 2011 and unveiled 30 percent of Mercury's surface never seen by a spacecraft.

"The region of Mercury's surface that we viewed at close range for the first time this month is bigger than the land area of South America," said Sean Solomon, principal investigator and director of the Department of Terrestrial Magnetism at the Carnegie Institution of Washington. "When combined with data from our first flyby and from Mariner 10, our latest coverage means that we have now seen about 95 percent of the planet."

The spacecraft's science instruments operated throughout the flyby. Cameras snapped more than 1,200 pictures of the surface, while the laser altimeter profiled the area's topography. The comparison of magnetosphere observations from the spacecraft's first flyby in January with data from the probe's second pass provids key new insight into Mercury's internal magnetic field and reveals new features of its magnetosphere. The magnetosphere is the volume surrounding Mercury that is controlled by the planet's magnetic field.

"The previous flybys by MESSENGER and Mariner 10 provided data only about Mercury's eastern hemisphere," said Brian Anderson of the Johns Hopkins University Applied Physics Laboratory (APL) in Laurel, Maryland. "The most recent flyby gave us our first measurements on Mercury's western hemisphere, and with them, we discovered that the planet's magnetic field is highly symmetric."

The probe's Mercury Laser Altimeter (MLA), allowed scientists, for the first time, to correlate high-resolution topography measurements with high-resolution images.

"The MLA collected altimetry in regions where images from MESSENGER and Mariner 10 data are available, and new images were obtained of the region sampled by the altimeter in January," said Maria Zuber, co-investigator and head of the Department of Earth, Atmospheric, and Planetary Sciences at the Massachusetts Institute of Technology. "These topographic measurements now improve considerably the ability to interpret surface geology."

The Mercury Atmospheric and Surface Composition Spectrometer observed Mercury's thin atmosphere, known as an exosphere. The instrument searched for emissions from sodium, calcium, magnesium, and hydrogen atoms. Observations of magnesium are the first detection of this chemical in Mercury's exosphere. Preliminary analysis suggests the spatial distributions of sodium, calcium, and magnesium are different. Simultaneous observations of these spatial distributions, also a first for the spacecraft, have opened a window into the interaction of Mercury's surface and exosphere.

Spacecraft images reveal for the first time vast geologic differences on the surface.

"Now that MESSENGER's cameras have imaged more than 80 percent of Mercury, it is clear that, unlike the moon and Mars, Mercury's surface is more homogeneously ancient and heavily cratered, with large extents of younger volcanic plains lying within and between giant impact basins," said co-investigator Mark Robinson of Arizona State University in Tempe.

See Astronomy.com's comprehensive coverage of MESSENGER's second flyby of Mercury.
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