  Solar sails enable missions to observe the solar environment from unique
vantage points, such as sustained observations away from the Sun-Earth line;
sub-L1 station keeping; high inclination solar orbits; Earth polar-sitting and
polar-viewing observatories; fast transit missions to study heliosphere to
interstellar medium transition, as well as missions of interest across a broad
user community. Recent and planned demonstration missions make this technology
ready for use on near-term science missions.
