1. What is the definition of a main sequence star?
A star that will eventually collapse into a black hole A star that has planets orbiting it A star that is about to explode A star that burns hydrogen in its core
A star that will eventually collapse into a black hole
A star that has planets orbiting it
A star that is about to explode
A star that burns hydrogen in its core
2. What can cause a white dwarf to reignite?
Gravitational flux Stellar mass transfer An asteroid impacting its surface White dwarfs never reignite.
Gravitational flux
Stellar mass transfer
An asteroid impacting its surface
White dwarfs never reignite.
3. What force keeps a star from collapsing?
Antigravity Magnetism Pressure Neutronic inversion
Antigravity
Magnetism
Pressure
Neutronic inversion
4. What is a planetary nebula?
An exploding star Matter ejected from a dying star A cluster of planets Remnants of destroyed planets
An exploding star
Matter ejected from a dying star
A cluster of planets
Remnants of destroyed planets
5. What is the final remnant of a star with an initial mass of less than about eight solar masses?
A black hole A neutron star A white dwarf A giant planet
A black hole
A neutron star
A white dwarf
A giant planet
6. What is the mass of the Sun?
0.875 solar masses 1 solar mass 3.875 solar masses 27.41 solar masses
0.875 solar masses
1 solar mass
3.875 solar masses
27.41 solar masses
7. What is hydrogen burning?
A movie The conversion of helium into hydrogen The conversion of hydrogen into helium The chemical burning of hydrogen
A movie
The conversion of helium into hydrogen
The conversion of hydrogen into helium
The chemical burning of hydrogen
8. Why do stars die?
They become black holes. They use up their nuclear fuel. They lose their magnetism. Planets collide with them.
They become black holes.
They use up their nuclear fuel.
They lose their magnetism.
Planets collide with them.
9. Which of the following is NOT a stellar remnant?
A black hole A white dwarf A red giant A neutron star
A red giant
10. How can a black hole be observed?
With optical telescopes With X-ray telescopes With radio telescopes A black hole cannot be directly observed.
With optical telescopes
With X-ray telescopes
With radio telescopes
A black hole cannot be directly observed.
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