Exploring the Cosmos - Degree Exam 2009 - Life and Death of Stars (Part 2)
1. Stars in the same cluster differ widely in
chemical composition
distance
age
mass
2. A globular cluster in our Galaxy is
a constellation such as Orion.
a group of very old stars.
a group of very young stars.
an asterism like the Pleiades.
3. Stars of ten times the solar mass
are more common than stars like the Sun.
shine for longer than the Sun.
are only found in globular clusters.
burn out more quickly than the Sun.
4. Interstellar gas is
mostly carbon monoxide.
mostly hydrogen.
of little importance astronomically.
all at a temperature close to absolute zero.
5. The Chandrasekhar limit is
around ten times the solar mass.
the maximum mass of a white dwarf.
the maximum radius of a red giant.
the radius of a black hole.
6. A red giant
is a stage in the life of our Sun.
looks very large through a telescope.
is hotter than a white dwarf.
fuses hydrogen in its core.
7. The CNO cycle is a nuclear reaction which
occurs mainly in carbon white dwarfs.
produces 'metals'.
occurs mainly in stars with cores hotter than the Sun.
causes the helium flash.
8. The Crab Nebula is of interest because it
is in the centre of the constellation Cancer.
surrounds the supernova SN1987A.
contains a black hole.
contains a pulsar.
9. Pulsars are
stars that periodically expand and contract.
rotating neutron stars.
rotating white dwarfs.
very large stars.
10. The final state of a star depends on its
chemical composition
degeneracy
magnitude
mass
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