1. Parallax is the
A) distance to an object, measured in parsecs.
B) angle subtended by an object, as seen by us.
C) apparent shift in position of a nearby object as we move.
D) shift in position of an object as it moves.
2. Stellar parallax is the
1. The statement that the apparent magnitude of a variable star has increased indicates that its
A) surface temperature has decreased.
C) brightness has decreased.
B) surface temperature has increased.
D) brightness has increased.
2. Two stars in our sky
1. Ancient Chinese astronomers recorded the appearance of what phenomenon in 1054 AD?
A) a nearby nova explosion, in our Galaxy
B) a brilliant auroral display covering the whole Earth.
C) a supernova, visible in daylight
D) a bright binary star undergoing
1. Light traveling away from the surface of a neutron star becomes strongly redshifted. What name is given
to this effect?
A) cosmological redshift B) Doppler shift C) Zeeman effect D) gravitational redshift
2. Spectral lines detected from the surfaces of
1. What very important phenomenon frequently occurs in binary star systems where stars are very close
A) The less massive star spirals slowly into its more massive companion because of tidal interactions.
B) The radiation from the hotter star wi
1. Which of the following objects does NOT represent the endpoint of a star's evolutionary life?
A) black hole B) neutron star C) red giant D) supernova
2. What are the main by-products of helium nuclear "burning" in red giant stars?
A) hydrogen nuclei vi
1. Certain stages of stellar evolution, such as birth of a protostar and post-main sequence red giant
evolution, come about because of an imbalance between gravity and
A) high-energy neutrino pressure.
C) the centrifugal force from rotation.
1. Which of the following is NOT a consequence of a coronal mass ejection event from the Sun, if the mass
ejection is aimed toward the Earth?
A) disruption to radio transmission and electrical power systems on Earth
B) damage to and even destruction of sa
1. The Sun's source of energy at the present time is thought to be
A) thermonuclear fusion (combining) of hydrogen atoms.
B) thermonuclear fission (splitting) of heavy elements into hydrogen.
C ) chemical burning of hydrogen gas with oxygen.
1. The speed of light in space is
A) very large, but not infinite: 3 1010 meters per second.
B) very large, 3 108 meters per second, independent of the speed of its source.
C) infinite, traveling through space instantaneously.
D) variable, depending on th