LECTURE 18, NOVEMBER 2, 2010 ASTR 101, SECTION 2 INSTRUCTOR, JACK BRANDT [email protected] 1ASTR...
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Transcript of LECTURE 18, NOVEMBER 2, 2010 ASTR 101, SECTION 2 INSTRUCTOR, JACK BRANDT [email protected] 1ASTR...
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ASTR 101-3, FALL 2010 1
LECTURE 18, NOVEMBER 2, 2010
ASTR 101, SECTION 2INSTRUCTOR, JACK BRANDT
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a) its core begins fusing iron.b) its supply of hydrogen is used up.c) the carbon core detonates, and it explodes as
a Type I supernova.d) helium builds up in the core, while the
hydrogen-burning shell expands.e) the core loses all of its neutrinos, so all fusion
ceases.
Question 3
The Sun will evolve away from the main sequence when
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a) its core begins fusing iron.b) its supply of hydrogen is used up.c) the carbon core detonates, and it explodes as
a Type I supernova.d) helium builds up in the core, while the
hydrogen-burning shell expands.e) the core loses all of its neutrinos, so all fusion
ceases.
Question 3
The Sun will evolve away from the main sequence when
When the Sun’s core becomes unstable and contracts, additional H fusion generates extra pressure, and the star will swell into a red
giant.
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a) red giants.b) pulsars.c) black holes.d) white dwarfs.e) red dwarfs.
Question 1
Stars like our Sun will end their lives as
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a) red giants.b) pulsars.c) black holes.d) white dwarfs.e) red dwarfs.
Question 1
Stars like our Sun will end their lives as
Low-mass stars eventually swell into red giants, and their cores
later contract into white dwarfs.
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a) an asteroid.b) a planet the size of Earth.c) a planet the size of Jupiter.d) an object the size of the Moon.e) an object the size of a sugar cube.
Question 8
In a white dwarf, the mass of the Sun is packed into the volume of
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a) an asteroid.b) a planet the size of Earth.c) a planet the size of Jupiter.d) an object the size of the Moon.e) an object the size of a sugar cube.
Question 8
In a white dwarf, the mass of the Sun is packed into the volume of
The density of a white dwarf is about a million times greater
than normal solid matter.
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a) mass transfer onto a white dwarf in a binary star system.
b) repeated helium fusion flashes in red giants.c) rapid collapse of a protostar into a massive O star.d) the explosion of a low-mass star.e) the birth of a massive star in a new cluster.
Question 11
A nova involves
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a) mass transfer onto a white dwarf in a binary star system.
b) repeated helium fusion flashes in red giants.c) rapid collapse of a protostar into a massive O star.d) the explosion of a low-mass star.e) the birth of a massive star in a new cluster.
Question 11
A nova involves
Sudden, rapid fusion of new fuel dumped onto a white dwarf
causes the star to flare up, and for a short time become much
brighter.
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a) the number of main sequence stars.b) the ratio of giants to supergiants.c) the luminosity of stars at the turnoff point.d) the number of white dwarfs.e) supernova explosions.
Question 6
Astronomers determine the age of star clusters by observing
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a) the number of main sequence stars.b) the ratio of giants to supergiants.c) the luminosity of stars at the turnoff point.d) the number of white dwarfs.e) supernova explosions.
Question 6
Astronomers determine the age of star clusters by observing
The H–R diagram of a cluster can indicate its approximate age.
Turnoff point from the main sequence
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a) as a protostar.b) as a red giant.c) as a main-sequence star.d) as a white dwarf.e) evolving from type O to type M.
Question 10
A star will spend most of its “shining” lifetime
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a) as a protostar.b) as a red giant.c) as a main-sequence star.d) as a white dwarf.e) evolving from type O to type M.
Question 10
A star will spend most of its “shining” lifetime
In the main-sequence stage, hydrogen fuses to helium.
Pressure from light and heat pushing out balances
gravitational pressure pushing inward.
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