After a year-long study, a National Research Council panel has concluded that sending a spacecraft to several bodies in the Kuiper Belt, including Pluto, should be NASA's highest solar-system priority in the coming decade. The NRC study, conducted by 60 top U.S. planetary scientists and released today, also endorses a Europa Geophysical Explorer (EGE) mission to place a craft in orbit around Jupiter's enigmatic icy moon Europa, as well as several other missions. But the survey committee made it clear that the Kuiper-Pluto mission's technical feasibility and lower cost give it "clear advantages over EGE."

The study's recommendations, kept confidential until today, come as a welcome surprise to the team working on the New Horizons mission, which could be launched as early as 2006 and reach Pluto and Charon (its moon) by 2016. "This is great news," says S. Alan Stern, the mission's principal investigator. "I've lost a lot of sleep this past week." Edward J. Weiler, NASA's associate administrator for space science, has stated that the space agency could not commit to a Pluto-Kuiper effort unless the planetary-science community backed it. The Bush administration excluded New Horizons from NASA's fiscal 2002 budget, but Congress later authorized $30 million to begin its development. Nor was it included in the president's fiscal 2003 budget, though Congress may opt to fund the mission anyway.

"Given the scientific value and the unique timing, we would be missing an historic opportunity if we don’t move forward with this project and make this mission a reality," comments Sen. Barbara A. Mikulski (Maryland), who chairs the Senate appropriations subcommittee responsible for NASA. "I intend to restore funding again this year, despite NASA’s failure to include money for Pluto in the FY03 budget."

Titled New Frontiers in the Solar System: An Integrated Exploration Strategy, the massive NRC study was initiated by Weiler in early 2001 in order to create community-wide consensus concerning key solar-system objectives and mission candidates. "To continue [solar-system] exploration in the most productive way," notes study chairman Michael J. S. Belton, NASA's missions must be prioritized." Belton and his 14-member steering committee modeled their effort after similar roadmaps that have been developed by the astrophysics community, the most recent of these having appeared last year.

Initially the NRC survey was to assess four broad topics: inner planets, giant planets, large satellites, and primitive bodies. However, when it became clear that other high-level groups were already engaged in assessing the prospects for Mars and astrobiology, these groups' expertise was added to the New Frontiers effort. A key component was input provided by nearly 400 planetary scientists through an extensive series of position papers, which are being published separately. "While there have been many previous NRC studies over the decades," notes Belton, "this is the first to involve the community as a whole."

In the end, the survey committee recommended a suite of missions for the period 2003–2013. These are grouped into three cost categories: "small" missions will cost less than $325 million; "New Frontiers," a mission category introduced in NASA's budget this year, will total less than $650 million and might be flown every three years; and "Flagship" missions, high-cost, once-per-decade undertakings that are well suited to international participation.

More information on Pluto can be found at the Pluto Portal.