MOST was a suitcase-sized microsatellite designed to probe stars and extrasolar planets by measuring tiny light variations undetectable from Earth. This was done with a small telescope (15 cm aperture) using new Canadian attitude control technology. The satellite was also equipped with an amateur radio payload.

Length: 0.65 m (2.13 ft). Maximum Diameter: 0.65 m (2.13 ft). Span: 0.30 m (0.98 ft). Mass: 60 kg (132 lb).

• 2003 June 30 - Most - Launch Site: Plesetsk. Launch Vehicle: UR-100N. Mass: 66 kg (145 lb). Perigee: 818 km (508 mi). Apogee: 834 km (518 mi). Inclination: 98.70 deg. Period: 101.40 min.

  MOST (Microvariability and Oscillations of Stars) was a Canadian Space Agency project with a 0.15m telescope which would make photometric observations of stars down to mag 6 with 1 part per million accuracy in the 3500-7000 Angstrom band.