A new report from the National Research Council, LAUNCHING SCIENCE: SCIENCE OPPORTUNITIES PROVIDED BY NASA'S CONSTELLATION PROGRAM, reviews science missions that would be uniquely suited to the new Constellation system of spacecraft being developed by NASA for human space exploration beyond low Earth orbit. The report evaluates 17 science mission concepts based on their potential to significantly advance a scientific field and therefore benefit from inclusion in the Constellation program. The report also provides preliminary cost estimates for each proposed mission and recommends which to pursue.