legible name _____________________________
Astro 203, Section 1, April 12, 2002, quiz 6
There is one best answer for each question. Please put that best answer
on the SCANTRON sheet IN PENCIL.
Note that there are ten questions on two sides of the quiz paper.


1)Before a star becomes a main sequence star, the fusion source
in its core is...
  a) gravitational collapse
  b) hydrogen burning
  c) helium burning
  d) carbon burning
  e) none

2) The fusion source in the core of a main sequence star is...
  a) gravitational collapse
  b) hydrogen burning
  c) helium burning
  d) carbon burning
  e) none


3) A star whose main-sequence core-fusion source has just run out of fuel,
which is on its way to becoming a red giant, has the following fusion
source...
  a) hydrogen burning in core
  b) hydrogen burning in a shell
  c) helium burning in core
  d) helium burning in a shell
  e) none

4) When a star is becoming a red giant for a second time, it has
just finished burning _____ in its core, and is now burning ______
(Each answer has 2 parts, one for each blank)
  a) hydrogen; helium
  b) helium; helium and hydrogen in shells
  c) carbon; neon in a shell
  d) carbon; neon in the core
  e) none

5) The photons being emitted from a planetary nebula originated
  a) from fusion in the envelope of the star
  b) in the collapsing, hot, core of the star
  c) from ``degeneracy fusion''
  d) in the original main sequence star

6) What is the most important source holding a 1-solar-mass main sequence 
   star up against gravity?
  a) degeneracy pressure
  b) radiation pressure
  c) thermal pressure (gas pressure)
  d) gravitational collapse
  e) radioactivity

7) What is holding a white dwarf up against gravity?
  a) degeneracy pressure
  b) radiation pressure
  c) thermal pressure (gas pressure)
  d) gravitational collapse
  e) radioactivity






8) After normal stellar evolution, a surviving ``stellar core''
   of about 2 solar masses becomes a ______ because ______
  a) black hole; no known force can hold it up against gravity
  b) white dwarf; electron degeneracy can provide the needed pressure
  c) neutron star; electron degeneracy cannot provide the needed pressure
  d) planetary nebula; the star is losing mass


9) A comet's tail can be a million miles long! When a comet is out
beyond the orbit of Pluto, say, what does it look like?
  a) an icy, dusty object a few miles across
  b) an object without a tail, larger than earth
  c) a ``shooting star''
  d) a white dwarf

10) What is the connection between comets and meteor showers?
  a) none- meteors are shooting STARS
  b) the earth is running into dust ejected from a comet body during the
     night(s) of a meteor shower
  c) the earth is running into the gas tail of a comet... this happened
     to us in 1910 with Halley's comet
  d) none- the ices from a comet become gases, not dust particles