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 constellation such as Orion.
an asterism like the Pleiades.
a group of very young stars.
2. T Tauri stars are
optically visible in their cocoon.
frequently strong infrared sources.
standard candles.
remnant cores of dead stars.
3. The Chandrasekhar limit is
the radius of a black hole.
around ten times the solar mass.
the maximum radius of a red giant.
the maximum mass of a white dwarf.
4. Protostars
are most easily observed by the IR radiation emitted.
usually emit pulses observable in radio waves.
are stars with abnormally high proton content.
are Population I stars.
5. Stars on the lower left part of the main sequence on a HR diagram are
red dwarfs.
white dwarfs.
blue giants.
red giants.
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
are a stage in the life of our Sun.
are very hot.
have nuclear reactions in their interior.
look very large through a telescope.
8. The Pauli exclusion principle explains
the solar neutrino problem.
why neutron stars collapse.
why white dwarfs are stable.
supernovae.
9. Type I and II supernovae
are both standard candles.
can reoccur.
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
magnitude.
degeneracy.
chemical composition.
mass.
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