Exploring the Cosmos - Class Test 2 - Life and Death of Stars (Part 2)
1. Globular clusters in our galaxy consist of groups of
newly born stars.
very large stars.
very old stars.
burnt out stars.
2. An open cluster consists of stars which are all
on the main sequence.
the same temperature.
the same mass.
around the same age.
3. Which of the following elements makes up a large fraction of a main sequence star?
Oxygen
Iron
Helium
Carbon
4. T Tauri stars are
standard candles.
remnant cores of dead stars.
frequently strong infrared sources.
optically visible in their cocoon.
5. The Sun generates heat by converting
helium to carbon through the CNO cycle.
hydrogen to helium through the proton-proton chain.
helium to carbon through the triple alpha reaction.
hydrogen to helium through the triple alpha reaction.
6. Main sequence stars with higher luminosity than the Sun
are only observed in globular clusters.
have a lower surface temperature than the Sun.
must be red giants.
have a shorter lifetime than the Sun.
7. Globular clusters mainly consist of groups of
very old stars.
very large stars.
newly born stars.
black holes.
8. T Tauri stars are
remnant cores of dead stars.
optically visible in their cocoon.
standard candles.
frequently strong infrared sources.
9. Open clusters
are only found in distant galaxies.
are metal poor.
have a smaller density of stars than globular clusters.
contain the oldest stars in our galaxy.
10. Stars in a single cluster differ widely in
mass.
chemical composition.
distance.
age.
11. Bok globules are
small star clusters.
Herbig Haro objects.
dense dust clouds out of which stars form.
T Tauri stars.
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