The theory that describes astronomer’s ideas about rapidly spinning neutron stars is:
the cosmological theory.
the pulsar vibrational theory.
the spinning top theory.
the lighthouse theory.
the habeas corpus theory.
Astronomers think our solar system’s Sun is located:
at the center of the Milky Way galaxy.
far out in the halo of the Milky Way galaxy.
in a globular cluster that orbits the Milky Way galaxy.
in the disk of the Milky Way galaxy.
at the bottom of the Wicomico River.
The disk of the Milky Way galaxy contains:
large amounts of gas, dust, and star forming regions.
structures that resemble spiral arms.
stars with nearly coplanar orbits.
young newly formed stars and even older stars.
all of the above.
Harlow Shapely used which of the following objects to investigate the extent of the Milky Way galaxy.
stars that go supernova.
neutron stars.
globular clusters.
the Maltese Falcon.
None of these answers.
An Sc galaxy would be characterized by:
a bar through the nucleus.
having only old stars in it.
a very large central bulge.
loosely wound spiral arms.
all of these answers are true.
An astronomer discovers a new fairly small galaxy and notices that it appears not to match any other galaxy’s shape, has a clumpy distribution of new stars, and lots of gas and dust. He has most probably found a(n):
barred spiral galaxy.
spiral galaxy.
irregular galaxy.
iguana.
elliptical galaxy.
Active Galaxies are thought to be powered by:
trillions of stars packed closely at their nucleus.
gravitational collapse of white dwarf stars.
stare decisis processes.
supernova explosions.
super-massive blackholes at their cores.
A closed universe:
is infinite in size.
has an edge.
will end in a "big crunch."
will never stop expanding.
all of these.
Albert Einstein’s views about gravity imply that:
space-time is curved by mass.
light rays that start off parallel to each other will eventually cross in a closed universe.
a blackhole is a severe warping of space-time.
the universe is expanding carrying galaxies along with the expansion.
