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