NASA/Goddard Space Flight Center, NASA Headquarters Acquisition Branch, Code 210.H, Greenbelt, MD 20771

A -- MEDIUM-CLASS EXPLORERS (MIDEX) AND MISSION OPPORTUNITY SOL AO-98-OSS-03 DUE 082198 POC John Lintott, Program Scientist, Phone (757) 864-9864, Fax (757) 864-8894, Email j.a.lintott@larc.nasa.gov WEB: Click here for the latest information about this notice, http://nais.nasa.gov/EPS/HQ/date.html#AO-98-OSS-03. E-MAIL: John Lintott, j.a.lintott@larc.nasa.gov. Announcement of Opportunity for the Explorer Program: Medium-class Explorers (MIDEX) and Missions of Opportunity. The National Aeronautics and Space Administration (NASA), Office of Space Science is releasing a NASA Announcement of Opportunity (AO 98-OSS-03) for the Medium-class Explorer (MIDEX) and Missions of Opportunity. NASA intends to select two MIDEX missions to launch by June 2003, and June 2004. A Mission of Opportunity may also be selected. The science objectives covered by the AO include those in the currently defined OSS science themes of the Astronomical Search for Origins, the Sun-Earth Connection, and the Structure and Evolution of the Universe. (Refer to the OSS World Wide Web homepage at <http://www.hq.nasa.gov/office/oss/&;gt; for further information about these themes.) Participation is open to all categories of organizations, foreign and domestic, including educational institutions, profit and nonprofit organizations, NASA centers, and other Government agencies. Upon the release date, specific guidance for proposal preparation will be available electronically from the World Wide Web by selecting Research Opportunities at: <http://www.hq.nasa.gov/office/oss/&;gt;. This solicitation will be open from March 25, 1998, through August 21, 1998. Printed copies may be obtained by written request to Mr. John Lintott, Space Science Support Office, Mail Stop 160, NASA Langley Research Center, Hampton, VA 23681-0001; FAX: (757) 864-8894; or E-mail: <j.a.lintott@larc.nasa.gov>. NOTICE: As of the end of March 1998, NASA OSS will discontinue using postcards to notify release of its research program announcements. All future notifications will be by electronic mail. Subscribe by sending an E-mail to <majordomo@hq.nasa.gov>; leave the Subject line blank but enter "subscribe oss-research" in the message body. It will be automatically acknowledged. This notice constitutes a NASA Research Announcement as contemplated in FAR 6.102(d)(2). (0070)

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