MOST Fact Sheet

The Canadian Space Agency's MOST project is a co-operative scientific partnership to create the world's smallest astronomical space telescope, capable of measuring the ages of stars in our galaxy and perhaps even unlocking mysteries of the universe itself.

Sponsored by the CSA's Space Science Branch, the various MOST project teams will design, build and monitor the microsatellite that will orbit 800 kilometres above the earth, allowing scientists to collect stellar data 24 hours a day.

The tiny satellite, weighing only 50 kilograms, will carry a high precision telescope no bigger in diameter than a pie plate. The device will measure the oscillation in light intensity of stars in order to determine their composition as well as age. Younger stars are comprised of more hydrogen than helium. Because hydrogen is lighter than helium, sound waves pass through it more quickly. These sound waves set up pulsations in the star's surface, producing changes in the light intensity of the star. The satellite's telescope can measure the oscillations in intensity of the star, thus estimating its age.

The MOST satellite is unique not only because of its small size, but because it will conduct stellar measurements from space. Traditionally, scientists have relied upon expensive, earth-based telescopes to provide research data. These instruments have been hampered by both the Earth's distorting atmosphere and its rotation -- allowing for only a partial viewing of a star due to the day-night cycle. In space, the MOST telescope will have an unblocked, constant view of a star for up to seven weeks at a time and will downlink data to ground stations at the University of British Columbia and the University of Toronto. The telescope will be mounted on a platform about the size of a suitcase. The ability to use such a small satellite for a space telescope is made possible by Dynacon's new, lightweight gyroscope technology that corrects the wobbling motion of the satellite, and controls accurately where the satellite is pointing.

Toronto-based Dynacon Enterprises Limited has been selected as the lead contractor in the MOST project. Other key partners include: the University of British Columbia, the University of Toronto Institute for Aerospace Studies (UTIAS), as well as the Centre for Research in Earth and Space Technology (CRESTech) of Toronto, the Radio Amateur Satellite Corporation (AMSAT), which includes both Canadian and US chapters, AeroAstro Corporation of Herndon, Virginia, the Royal Astronomical Society of Canada (RASC), and a team of consulting scientists from across Canada and the United States led by the Principal Investigator, Prof. Jaymie Matthews, of the Department of Physics and astronomy of the University of British Columbia.

Canada is already a noted leader in the study of stellar pulsation and rapid variability. The MOST project will build on this expertise, helping to expand upon and answer fundamental questions about the nature of the universe that have intrigued scientists and non-scientists alike since the beginning of time.