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