HW 13

A  consist largely of uranium and other very heavy elements.

B  consist largely of carbon and oxygen.

C  are the end states only of stars whose initial mass if much greater than that of the Sun.

D  shine only while nuclear reactions continue within them.

E  support themselves against the pull of gravity in the same way as normal stars link the Sun, using the pressure exerted by hot gases within them.

A  At optical wavelengths, a supernova can appear about as bright as the entire galaxy of stars in which it’s located.

B  One kind of supernova occurs when iron core of a massive star collapses.

C  A neutron star is produced when a white dwarf exceeds a certain mass limit and becomes a supernova, experiencing a runaway chain of nuclear fusion reactions.

D  A supernova produces an expanding volume of gas that is rich in heavy elements.

A  the core expands and thus heats up.

B  the core contracts and thus cools down.

C  the core expands and thus cools down.

D  the core remains about the same size, but heats up as fusion of helium to carbon begins immediately after the hydrogen fuel is gone.

E  the core contracts and thus heats up.

A  carbon & oxygen

B  iron

C  silica & sulphur

D  deuterium & tritium

E  helium

A  brown dwarf

B  neutron star

C  white dwarf

D  Black Hole

A  FALSE

B  TRUE

A  Lagrange point

B  Center Mass

C  Roche Lobe

D  Roche Radius

A  electromagnetic waves

B  gravitational pull

C  electromagnetic force

D  gravitational waves

A  neutron stars

B  white dwarf

C  quasar

D  pulsar

A  black hole

B  nebulae

C  fusion

D  nova

A  reflection nebula

B  emission nebula

C  planetary nebula

D  solar nebula