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