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