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 constellation such as Orion.
an asterism like the Pleiades.
a group of very young stars.
a group of very old stars.
3. Stars of ten times the solar mass
shine for longer than the Sun.
burn out more quickly than the Sun.
are only found in globular clusters.
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
around ten times the solar mass.
the maximum mass of a white dwarf.
the radius of a black hole.
the maximum radius of a red giant.
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
occurs mainly in stars with cores hotter than the Sun.
causes the helium flash.
occurs mainly in carbon white dwarfs.
produces 'metals'.
8. The Crab Nebula is of interest because it
contains a black hole.
is in the centre of the constellation Cancer.
surrounds the supernova SN1987A.
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
mass
chemical composition
degeneracy
magnitude
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