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 young stars.
a constellation such as Orion.
an asterism like the Pleiades.
a group of very old stars.
3. Stars of ten times the solar mass
are more common than stars like the Sun.
burn out more quickly than the Sun.
shine for longer than the Sun.
are only found in globular clusters.
4. Interstellar gas is
all at a temperature close to absolute zero.
mostly hydrogen.
of little importance astronomically.
mostly carbon monoxide.
5. The Chandrasekhar limit is
the maximum mass of a white dwarf.
the radius of a black hole.
the maximum radius of a red giant.
around ten times the solar mass.
6. A red giant
is a stage in the life of our Sun.
fuses hydrogen in its core.
is hotter than a white dwarf.
looks very large through a telescope.
7. The CNO cycle is a nuclear reaction which
produces 'metals'.
causes the helium flash.
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
contains a black hole.
surrounds the supernova SN1987A.
contains a pulsar.
is in the centre of the constellation Cancer.
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
magnitude
degeneracy
mass
chemical composition
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