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