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9 Cards in this Set

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distances to galaxies out to 13 million light years is done comparing using lumisoty of what?
cephid variables (the period-luminosity relationship)
Think Hubble/Shapley
distances of galaxies out to 82 million light years is done measureing lumisoty of what?
bright O and B stars. They have an upward limit of find the brightest one in the galaxy.
we can see them in the galaxies in Big Dipper.
Beyond 82 millio light years, we use what to determine distance to galaxies?
(2 things)
Supergiant spirals, with small nuclei. They have absolute magnitude of -21. (i.e., M 101).
We also use red shift.
2 things.
brightest blue supergiants in large spiral galaxies have absolute magnitude of about what?
Milky way galaxy has a nucleus of what color stars?
Milkyway galaxy has spiral arms of what color stars?
Three basic types of galaxies, smallest to largest:
irregular, elliptical, spiral
magelanic clouds, big round blobs, Andromeda
our sun is how many lr from center?
33,000 lyrs
sun circuits galaxy in how many years
2.4 x 10(8)
or 240 million years
(i thought it was closer to 300 mill).