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.
a group of very old stars.
an asterism like the Pleiades.
2. T Tauri stars are
remnant cores of dead stars.
frequently strong infrared sources.
optically visible in their cocoon.
standard candles.
3. The Chandrasekhar limit is
the maximum mass of a white dwarf.
around ten times the solar mass.
the radius of a black hole.
the maximum radius of a red giant.
4. Protostars
are stars with abnormally high proton content.
are Population I stars.
usually emit pulses observable in radio waves.
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
red giants.
red dwarfs.
white dwarfs.
blue giants.
6. The Crab Nebula is of interest because it
contains a pulsar.
surrounds the supernova SN1987A.
contains a black hole.
is in the centre of the constellation Cancer.
7. Red giants
have nuclear reactions in their interior.
look very large through a telescope.
are a stage in the life of our Sun.
are very hot.
8. The Pauli exclusion principle explains
why neutron stars collapse.
the solar neutrino problem.
supernovae.
why white dwarfs are stable.
9. Type I and II supernovae
can reoccur.
will occur in stars less massive than the Sun.
will occur in stars more massive than the Sun.
are both standard candles.
10. The final state of a star depends mainly on its
magnitude.
degeneracy.
chemical composition.
mass.
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