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