1) The more distant a galaxy, a) the lower its redshift b) the farther into its
ID: 1308067 • Letter: 1
Question
1) The more distant a galaxy,
a) the lower its redshift
b) the farther into its past we observe
c) the older the galaxy
d) the larger the galaxy
e) all of the above
2) The Cosmological Principle states
a) there are no preferred places in the Universe
b) the Universe is expanding
c) the Universe is contracting
d) the Universe is empty
e) we are not at the center of the Universe
3) The most distant galaxies are 12 billion light-years away. From this fact we conclude that
a) galaxies are older than the Universe
b) the Universe is at least 12 billion years old
c) the speed of light decreases with distance
d) all galaxies are at least 12 billion light-years away
e) there are no galaxies beyond 12 billion light-years
4) Galaxies at 6 billion light-years away are bluer than nearby galaxies. Galaxies at 10 billion light-years away will be
a) redder
b) bluer
c) the same color
d) cannot determine from information given
e) all of the above
5) Number evolution means
a) there are bluer galaxies in the past
b) there are redder galaxies in the past
c) there are fewer galaxies in the past
d) there are more galaxies in the past
e) none of the above
6) A static Universe is impossible because
a) spacetime must expand
b) magnetic fields force repulsion
c) magnetic fields force attraction
d) it is unstable to gravitational collapse
e) blackholes are not allowed
7) Hubble's law means
a) the recession velocity of a galaxy increases with distance
b) the Universe is expanding
c) the distance of a galaxy can be determined from its velocity
d) the reciprocal of Hubble's constant is an approximate age of the Universe
e) all of the above
8) Redshift is the velocity of a galaxy divided by the speed of light. If the redshift of a galaxy is 0.5, then its recession velocity is
a) 300,000 km/s
b) 150,000 km/s
c) 20,000 km/s
d) 10,000 km/s
e) cannot determine from information given
9) An expanding Universe means
a) the galaxies are moving
b) the spacetime between galaxies is increasing
c) galaxies speed up
d) comoving coordinates increase
e) comoving coordinates decrease
10) The hot Big Bang model assumes
a) the Universe expands rapidly from a compressed primordial state
b) the Universe increases in temperature
c) the Universe exploded in the beginning
d) the Universe will collapse someday
e) galaxies are fixed in their comoving coordinates
Explanation / Answer
1) b) the farther into its past we observe
Reason : the light takes longer to reach us.
2) a) there are no preferred places in the Universe
3) b) the Universe is at least 12 billion years old
4) a) redder
Reason : Due to the increase in wavelength.
5) c) there are fewer galaxies in the past
6) a) spacetime must expand
7) a) the recession velocity of a galaxy increases with distance
8) b) 150,000 km/s
9) b) the spacetime between galaxies is increasing
10) a) the Universe expands rapidly from a compressed primordial state (OR)
c) the Universe exploded in the beginning
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