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