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