Astronomy Final

21 cards   |   Total Attempts: 188
  

Cards In This Set

Front Back
The energy source at the center of our galaxy...
1) Is not visible at optical wavelengths
2) Produces X-rays
3) Must be less than 10 AU in diameter
In the late 1990s it was announced that the expansion of the universe is accelerating. What doe this imply from the perspective of the Big Bang Theory?
A force exists that we knew nothing about that causes the acceleration
The cosmic background radiation comes from a time after the origin of the universe...
When electrons began to recombine with nuclei to form atoms
What behavior do galactic rotation curves exhibit to suggest the existence of dark matter in an extended halo?
Large velocities are seen at large distances from the galactic center
Which of the following can't be associated with the spiral arms of a galaxy?
Metal poor stars
A spiral galaxy contains...
Upper and lower main sequence stars and gas and dust
Where did CMB come from?
Photons released when electrons and nuclei combined for the first time
Current evidence suggests that the universe is...
Flat, infinite, and accelerating in its expansion
The Milky Way Galaxy is a part of...
The Local Group
How are astronomers able to determine that quasars are so small?
They are only found at very large distances
______ of the Milky Way contains very old stars and globular clusters
The spiral arms
The event horizon...
Has a radius equal to the Schwarzchild radius
The size of a neutron star
Smaller than any of these
Younger stars have heavier elements because...
The heavy elements were made in previous generations of stars
_____ galaxies contain large clouds of gas and dust, both young and old stars, but have no obvious spiral arms or nucleus
Irregular