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