Circle the best answer for each question.

1		The big bang that gave rise to our universe happened about
			A)	6 billion years ago
			B)	15 billion years ago
			C)	25 billion years ago
			D)	56 billion years ago
2		The Milky Way Galaxy
			A)	is in the shape of a huge sphere
			B)	is composed of fewer than 50 million stars
			C)	is a spiral-shaped galaxy
			D)	consists of stars all of the same age
3		The sun makes a complete circuit of the Milky Way once every
			A)	10,000 years
			B)	100,000 years
			C)	100 billion years
			D)	240 million years
4		The object thought to lie at the center of the Milky Way Galaxy is a
			A)	pulsar
			B)	Cepheid variable
			C)	black hole
			D)	quasar
5		The position of the sun within the Milky Way is
			A)	near the galaxy's center
			B)	about two-thirds of the distance from the center
			C)	about one-half of the distance from the center
			D)	near the galaxy's outer edge
6		Population I stars
			A)	are found in the central disk of the Milky Way
			B)	make up the globular clusters
			C)	are all very old stars
			D)	are richer in hydrogen and helium than Population II stars
7		The strongest sources of radio waves from space are
			A)	pulsars
			B)	galactic nebulas
			C)	quasars
			D)	spiral galaxies
8		Primary cosmic rays
			A)	are possibly produced during supernova explosions
			B)	consist mostly of neutrons
			C)	are produced by radioactive substances in the earth's crust
			D)	are rarely encountered by the earth
9		According to Hubble's law
			A)	the more distant a galaxy, the faster it is moving away from us
			B)	the more distant a galaxy, the slower it is moving away from us
			C)	the closer a galaxy, the faster it is moving away from us
			D)	all galaxies move toward or away from us at the same speed regardless of distance
10		Quasars
			A)	have very large blue shifts
			B)	are very close to the Milky Way
			C)	are about the size of a galaxy
			D)	show rapid fluctuations in light and/or radio outputs
11		Which of the following does not support the big bang theory of the origin of the universe?
			A)	the presence of cosmic background radiation
			B)	the presence of dark matter
			C)	the uniform expansion of the universe
			D)	the relative abundances of hydrogen and helium in the universe
12		The existence of planets outside of our own solar system is difficult to verify because of all the following reasons except
			A)	planets are too dim to be seen directly
			B)	planets are too small to be seen even with the best telescopes
			C)	planetary systems are probably very rare throughout the universe
			D)	the distances between the earth and other planetary systems are very great