A small Canadian satellite launched in 2003 June that carries a 0.15-m telescope to monitor stars down to 6th magnitude for surface oscillations. Its other goals are to detect light reflected from giant planets orbiting Sun-like stars and to study mass loss from Wolf–Rayet stars.
http://www.asc-csa.gc.ca/eng/satellites/most/default.asp Mission page at Canadian Space Agency.
http://www.astro.ubc.ca/MOST/ Official mission website.
Subjects: Astronomy and Astrophysics.