Exploring the Cosmos - Degree Exam 2008 - Life and Death of Stars (Part 2)
1. 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.
2. T Tauri stars are
frequently strong infrared sources.
standard candles.
remnant cores of dead stars.
optically visible in their cocoon.
3. The Chandrasekhar limit is
around ten times the solar mass.
the maximum mass of a white dwarf.
the maximum radius of a red giant.
the radius of a black hole.
4. Protostars
are stars with abnormally high proton content.
usually emit pulses observable in radio waves.
are Population I stars.
are most easily observed by the IR radiation emitted.
5. Stars on the lower left part of the main sequence on a HR diagram are
white dwarfs.
red giants.
blue giants.
red dwarfs.
6. The Crab Nebula is of interest because it
contains a pulsar.
contains a black hole.
is in the centre of the constellation Cancer.
surrounds the supernova SN1987A.
7. Red giants
have nuclear reactions in their interior.
are very hot.
are a stage in the life of our Sun.
look very large through a telescope.
8. The Pauli exclusion principle explains
why neutron stars collapse.
supernovae.
why white dwarfs are stable.
the solar neutrino problem.
9. Type I and II supernovae
will occur in stars more massive than the Sun.
can reoccur.
are both standard candles.
will occur in stars less massive than the Sun.
10. The final state of a star depends mainly on its
chemical composition.
magnitude.
mass.
degeneracy.
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