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27 terms

Astronomy 101

STUDY
PLAY
We see a planetary nebula when
A star finishes its Red Giant Stage
Stars are formed
from collapse and fragmentation of molecular clouds.
A red giant may be producing energy via
Helium-carbon fusion
A pulsar is a type of
neutron star
Whether a star ends up as a black hole, neutron star, or white dwarf
depends on its final
mass
The evidence to date for the existence of black holes relies on
GRAVITATIONAL EFFECTS ON SURROUNDING OBJECTS.
We believe the Milky Way to be a spiral galaxy, based on
THE OVERALL FLAT SHAPE AND ROTATION OF THE MILKY WAY.
Early attempts to estimate the size of the Milky Way were defeated by
INTERSTELLAR ABSORPTION BY DUST.
Our location in the Milky Way is best described as
IN AN OUTER SPIRAL ARM
Stars of population I are most easily found
IN THE DISK
Very detailed observations of distant galaxies show that
THERE WERE ONCE MANY MORE SPIRALS IN CLUSTERS THAN WE NOW SEE
A "typical" galaxy is
DIM AND PART OF A GROUPING.
Clusters of galaxies contain a substantial amount of
HOT GAS AT A FEW MILLION DEGREES
To detect mass, you have to use
gravity
Every galaxy has a
super massive black hole
Cynus X-1
nailed the existence of blackholes
Light and dark areas in the Milky Way are caused by
dust grains
Globular clusters concentrated in
the constellation Sagittarius.
Type 1 Stars
Brightest stars are blue (young populations), make up the spiral arms.
Type 2 Stars
Brightest stars are red, older, globular clusters, bulge plus halo. When population 2 stars formed, the galaxy was round.
Cosmic Rays are caused by
supernova explosions
As you move from ellipticals to spirals,
cold gas forms new star formations.
Dust and clouds settle in the _______ part of a galaxy
flat disk
Older stars settle in the ______ of a galaxy
bulge
The Whirlpool Galaxy
first galaxy to show that there were spirals.
Winding arms of a galaxy are often caused by
the gravity of a neighboring galaxy.
Dark Matter does not emit
detectable radiation