- The Sun is a main-sequence star. Where did the
calcium that we see on the Sun's surface come from? Prove that the sun could not have made it.
- Cite the evidence that all globular star clusters are old.
- Why are main-sequence stars so much more common than
red giants?
- Since all stars smaller than about two solar masses evolve into white dwarfs
and since such stars are so plentiful, why don't we see billions of white dwarf stars?
- Imagine that the temperature of the center of a star is suddenly increased. What will
happen and why?
- In the Big Bang Theory of the origin of the Universe,
why do distant galaxies have large velocities of recession?
- In spiral galaxies one finds regions of ionized hydrogen containing
very hot stars strung out like beads along the spiral arms. What implications does this have for star
formation?
- Can a red main-sequence star be young? Explain fully.
- Population II stars are expected to form in a collapsing cloud
of gas after the Population III stars have died. This collapsing cloud marks the formation of a galaxy.
Compare the luminosity of elliptical and spiral galaxy of the same mass at this stage.
- Why will most stars die as white dwarfs?
- In the Big Bang Theory, how do we estimate the age of the Universe?
- Why don't elliptical galaxies have disks full of Population I stars?
- Why doesn't a white dwarf star collapse as it cools?
- Remembering only how the main sequence lies in the H-R
diagram, how can you prove that main-sequence O stars are burning their hydrogen much faster than
main-sequence M stars?
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