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MOST (Microvariability and Oscillations of STars) |
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Creating next-generation micro-satellites
![](/web/20071210091419im_/http://www.space.gc.ca/asc/app/gallery/gallery/med/most-02.JPG)
The MOST project is a cooperative 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 designed, built and monitor the
microsatellite that orbits 800 kilometres above the Earth,
so scientists can collect stellar data 24 hours
a day.
The tiny satellite weighs only 60 kilograms and carries a high-precision telescope no
wider 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
more of hydrogen than helium. Sound waves pass through hydrogen
faster because it is lighter than helium. The sound waves set up pulsations in the star's surface,
producing changes in the light intensity of the star. The
satellite's telescope measures 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 can 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 has an direct and constant
view of a star for up to seven weeks at a time and can downlink data to ground stations at the University of
British Columbia and the University of Toronto. The
telescope is 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 light gyroscope technology that corrects the wobbling
motion of the satellite and accurately controls where the
satellite is pointing.
Toronto-based Dynacon
Enterprises Limited was 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
U.S. chapters, AeroAstro, Inc. of Ashburn, Virginia,
Spectral
Applied Research, Routes
AstroEngineering, the Royal
Astronomical Society of Canada (RASC), and a team of
consulting scientists from across Canada and the U.S., 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 builds
on this expertise, helping to answer and expand upon
fundamental questions about the nature of the universe that
have intrigued scientists and non-scientists alike since the
beginning of time.
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