July 1, 2008

J D Harrington Headquarters, Washington 202-358-5241 j d harrington@nasa gov

Paulette Campbell Johns Hopkins University Applied Physics Laboratory, Laurel, Md 240-228-6792 paulette campbell@jhuapl edu

MEDIA ADVISORY: M08-128

NASA TO REVEAL NEW DISCOVERIES FROM MERCURY

WASHINGTON -- NASA will host a media teleconference Thursday, July 3, at 2 p m EDT, to discuss analysis of data from the Mercury Surface, Space Environment, Geochemistry and Ranging (MESSENGER) spacecraft's flyby of Mercury earlier this year

The spacecraft is the first designed to orbit the planet closest to the sun It flew past Mercury on Jan 14, 2008, and made the first up-close measurements since Mariner 10's final flyby in 1975

Analyses of the data show volcanoes were involved in the formation of plains The data also suggest the planet's magnetic field is actively produced in its core In addition, the mission has provided the first look at the chemical composition of Mercury's surface The results will be reported in a series of 11 papers published July 4 in a special section of Science magazine

The teleconference participants are: - Marilyn Lindstrom, program scientist, NASA Headquarters - Sean Solomon, principal investigator, Carnegie Institution of Washington - James W Head III, professor of geological sciences, Brown University, Providence, R I - William McClintock, senior research associate, Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder - Thomas H Zurbuchen, associate professor, Department of Atmospheric, Oceanic and Space Sciences, University of Michigan, Ann Arbor

Reporters may access the embargoed science press package materials by registering with EurekAlert! at www eurekalert org and e-mailing scipak@aaas org to expedite their registration Once registered, they may log in directly at:

http://www eurekalert org/jrnls/sci/

To participate in the teleconference, reporters in the United States should call 1-888-455-3616 and use the passcode "messenger " International reporters should call 1-517-623-4705 Audio of the teleconference will be streamed live at:

http://www nasa gov/newsaudio

When the briefing begins, related images will be available at:

http://messenger jhuapl edu/news_room/index php

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