Stellar Explosions & Remnants
11 days ago
astronomydad
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20 QuestionsShow answers
  • Question 1
    45 seconds
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    Q.

    Term for "new star" that occurs in mass-transfer binary and/or white dwarf companion stars.

    answer choices

    supernova

    stella nova

    pulsar

    neutron star

  • Question 2
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    Q.

    As material is added to the accretion disk, _____ may reach a temporary fusion point.

    answer choices

    pressures

    electron degeneracy

    temperatures

    matter

  • Question 3
    60 seconds
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    Q.

    Contact binaries may allow a white dwarf star to repeat

    answer choices

    electron degeneracy pressure.

    Roche lobe overload.

    flashes.

    explosions.

  • Question 4
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    Q.

    A supernova occurs when a _____ star runs out of fuel (or overloads) and explodes.

    answer choices

    sun-like

    single

    massive

    double

  • Question 5
    45 seconds
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    Q.

    A ____ star with a mass of 1.4 suns may go supernova (I) if too much material accretes.

    answer choices

    white dwarf

    red dwarf

    red giant

    neutron

  • Question 6
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    Q.

    Type II supernovae occur when a star with at least ____ times the mass of our sun explodes.

    answer choices

    1.4

    1.5

    3

    8

  • Question 7
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    Q.

    Supernova 1987(a) occurred in this nearby galaxy 186,000 light years away.

    answer choices

    Andromeda

    Small Magellanic Cloud (SMC)

    Large Magellanic Cloud (LMC)

    M16

  • Question 8
    30 seconds
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    Q.

    Supernovae regularly occur in galaxies throughout the visible Universe.

    answer choices

    True

    False

  • Question 9
    60 seconds
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    Q.

    Type II supernovae explosions may leave behind a

    answer choices

    neutron star

    black hole

    pulsar

    white dwarf

  • Question 10
    45 seconds
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    Q.

    Neutron stars are formed when gravity squeezes electrons & _____ into neutrons in a supernova.

    answer choices

    protons

    isotopes

    quarks

    matter

  • Question 11
    45 seconds
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    Q.

    Neutron stars are between 1.4 - 3.2 solar masses and are compacted into an area

    answer choices

    the size of Earth.

    about the size of a large country.

    the size of the Sun.

    about the size of a city.

  • Question 12
    30 seconds
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    Q.

    One teaspoon of neutron star material can weigh more than

    answer choices

    Mt. Everest.

    a planet.

    a star.

    a black hole

  • Question 13
    30 seconds
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    Q.

    _____ are rapidly spinning neutron stars that are known as "lighthouses" in space.

    answer choices

    Quasars

    White dwarfs

    Pulsars

    Black holes

  • Question 14
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    Q.

    Millisecond pulsars spin many times per second and have

    answer choices

    slowed down a lot over the years.

    very strong magnetic fields.

    sped up over the years.

    very weak magnetic fields.

  • Question 15
    30 seconds
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    Q.

    Pulsars were first detected in the 1960's by astronomers using radio telescopes.

    answer choices

    True

    False

  • Question 16
    45 seconds
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    Q.

    A black hole will form if the original star has at least _____ solar masses before collapse.

    answer choices

    four

    six

    eight

    ten

  • Question 17
    45 seconds
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    Q.

    The "cutoff mass" between a neutron star and a black hole is about ____ solar masses.

    answer choices

    1.4

    3.2

    4.4

    6.0

  • Question 18
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    Q.

    The area or boundary in which nothing can return from a black hole is called

    answer choices

    the singularity.

    Interstellar.

    the path of no return.

    the event horizon.

  • Question 19
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    Q.

    The ____ radius describes the size of the event horizon (which is black hole mass dependent).

    answer choices

    Hawking

    inner

    outer

    Schwarzschild

  • Question 20
    60 seconds
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    Q.

    There may be ____ of black holes in our galaxy alone - with Cygnus X-1 being the closest.

    answer choices

    billions

    millions

    hundreds

    thousands

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