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- 1. Multiple Choice
Term for "new star" that occurs in mass-transfer binary and/or white dwarf companion stars.
supernova
stella nova
pulsar
neutron star
- 2. Multiple Choice
As material is added to the accretion disk, _____ may reach a temporary fusion point.
pressures
electron degeneracy
temperatures
matter
- 3. Multiple Choice
Contact binaries may allow a white dwarf star to repeat
electron degeneracy pressure.
Roche lobe overload.
flashes.
explosions.
- 4. Multiple Choice
A supernova occurs when a _____ star runs out of fuel (or overloads) and explodes.
sun-like
single
massive
double
- 5. Multiple Choice
A ____ star with a mass of 1.4 suns may go supernova (I) if too much material accretes.
white dwarf
red dwarf
red giant
neutron
- 6. Multiple Choice
Type II supernovae occur when a star with at least ____ times the mass of our sun explodes.
1.4
1.5
3
8
- 7. Multiple Choice
Supernova 1987(a) occurred in this nearby galaxy 186,000 light years away.
Andromeda
Small Magellanic Cloud (SMC)
Large Magellanic Cloud (LMC)
M16
- 8. Multiple Choice
Supernovae regularly occur in galaxies throughout the visible Universe.
True
False
- 9. Multiple Choice
Type II supernovae explosions may leave behind a
neutron star
black hole
pulsar
white dwarf
- 10. Multiple Choice
Neutron stars are formed when gravity squeezes electrons & _____ into neutrons in a supernova.
protons
isotopes
quarks
matter
- 11. Multiple Choice
Neutron stars are between 1.4 - 3.2 solar masses and are compacted into an area
the size of Earth.
about the size of a large country.
the size of the Sun.
about the size of a city.
- 12. Multiple Choice
One teaspoon of neutron star material can weigh more than
Mt. Everest.
a planet.
a star.
a black hole
- 13. Multiple Choice
_____ are rapidly spinning neutron stars that are known as "lighthouses" in space.
Quasars
White dwarfs
Pulsars
Black holes
- 14. Multiple Choice
Millisecond pulsars spin many times per second and have
slowed down a lot over the years.
very strong magnetic fields.
sped up over the years.
very weak magnetic fields.
- 15. Multiple Choice
Pulsars were first detected in the 1960's by astronomers using radio telescopes.
True
False
- 16. Multiple Choice
A black hole will form if the original star has at least _____ solar masses before collapse.
four
six
eight
ten
- 17. Multiple Choice
The "cutoff mass" between a neutron star and a black hole is about ____ solar masses.
1.4
3.2
4.4
6.0
- 18. Multiple Choice
The area or boundary in which nothing can return from a black hole is called
the singularity.
Interstellar.
the path of no return.
the event horizon.
- 19. Multiple Choice
The ____ radius describes the size of the event horizon (which is black hole mass dependent).
Hawking
inner
outer
Schwarzschild
- 20. Multiple Choice
There may be ____ of black holes in our galaxy alone - with Cygnus X-1 being the closest.
billions
millions
hundreds
thousands
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