  BRITE-Constellation is devoted to high-precision optical photometric
monitoring of bright stars, distributed all over the Milky Way, in red and/or
blue passbands. Photometry from space avoids the turbulent and absorbing
terrestrial atmosphere and allows for very long and continuous observing runs
with high time resolution and thus provides the data necessary for
understanding various processes inside stars (e.g., asteroseismology) and in
their immediate environment. While the first astronomical observations from
space focused on the spectral regions not accessible from the ground it soon
became obvious around 1970 that avoiding the turbulent terrestrial atmosphere
significantly improved the accuracy of photometry and satellites explicitly
dedicated to high-quality photometry were launched. A perfect example is
BRITE-Constellation, which is the result of a very successful cooperation
between Austria, Canada and Poland. Research highlights for targets distributed
nearly over the entire HRD are presented, but focus primarily on massive and
hot stars.
