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