...mathematical models of the Sun.
  • Which of these groups of particles has the greatest mass?
  • Scientists estimate the central temperature of the Sun using...
  • At the center of the Sun, fusion converts hydrogen into...
  • Which of these stars does not have fusion occurring in its core?
...get smaller.
  • If the star Alpha Centauri were moved to a distance 10 times farther than it is now, its parallax angle would...
  • How does the number of neutrinos passing through your body at night compare with the number passing through your body during the day?
  • At the center of the Sun, fusion converts hydrogen into...
  • What would happen to a neutron star with an accretion disk orbiting in a direction opposite to the neutron star's spin?
It shrinks and heats up.
  • What happens to the core of a high mass star after it runs out of hydrogen?
  • What would happen to a neutron star with an accretion disk orbiting in a direction opposite to the neutron star's spin?
  • What would you be most likely to find if you returned to the solar system in 10 billion years?
  • What happens to a low mass star after a helium flash?
It's spin would slow down.
  • What would happen if the Sun suddenly became a black hole without changing its mass?
  • What would happen to a neutron star with an accretion disk orbiting in a direction opposite to the neutron star's spin?
  • How does the number of neutrinos passing through your body at night compare with the number passing through your body during the day?
  • What would you be most likely to find if you returned to the solar system in 10 billion years?
They are cooler than their surroundings.
  • Which of these groups of particles has the greatest mass?
  • What do we need to measure in order to determine a star's luminosity?
  • Why do sunspots appear darker than their surroundings?
  • Which of these stars has the coolest surface temperature?
A cluster whose brightest main sequence stars are yellow is the oldest.
  • Which of these stars is the most massive?
  • What causes the cycle of solar activity?
  • Which of these stars has the longest lifetime?
  • Which of these star clusters is oldest?
The photosphere is the coolest.
  • Which of these stars has the largest radius?
  • Which of these stars is the most massive?
  • Which of these stars has the longest lifetime?
  • Which layer of the Sun is the coolest?
Extremely distant galaxies produce gamma-ray bursts.
  • Which of these stars has the longest lifetime?
  • Which of these stars has the largest radius?
  • Where do gamma-ray bursts tend to come from?
  • Which of these stars is the most massive?
Four individual protons have the most mass.
  • Which of these stars has the greatest surface temperature?
  • Which of these stars has the largest radius?
  • Which of these stars has the coolest surface temperature?
  • Which of these groups of particles has the greatest mass?
...an object not quite massive enough to be a star.
  • Where do gamma-ray bursts tend to come from?
  • Which of these stars has the longest lifetime?
  • A brown dwarf is...
  • Which of these stars is the most massive?
The time between eclipses and the average distance between the stars is needed.
  • What would you be most likely to find if you returned to the solar system in 10 billion years?
  • What two pieces of information would you need in order to measure the masses of stars in an eclipsing binary system?
  • What would happen to a neutron star with an accretion disk orbiting in a direction opposite to the neutron star's spin?
  • Which of these binary systems is most likely to contain a black hole?
An X-ray binary containing an O star and another object of equal mass.
  • Which of these stars has the greatest surface temperature?
  • Which of these stars has the coolest surface temperature?
  • Which of these binary systems is most likely to contain a black hole?
  • Which of these isolated neutron stars must have had a binary companion?
They are about the same.
  • What would you be most likely to find if you returned to the solar system in 10 billion years?
  • Why do sunspots appear darker than their surroundings?
  • How does the number of neutrinos passing through your body at night compare with the number passing through your body during the day?
  • What would happen to a neutron star with an accretion disk orbiting in a direction opposite to the neutron star's spin?
Its flashes would shift to the infrared part of the spectrum.
  • Which of these isolated neutron stars must have had a binary companion?
  • What would stars be like if hydrogen had the smallest mass per nuclear particle?
  • How would a flashing red light appear as it fell into a black hole?
  • What would happen to a neutron star with an accretion disk orbiting in a direction opposite to the neutron star's spin?
Its luminosity goes down.
  • What happens to a low mass star after a helium flash?
  • What happens to the core of a high mass star after it runs out of hydrogen?
  • Why do sunspots appear darker than their surroundings?
  • At the center of the Sun, fusion converts hydrogen into...
A red giant does not have fusion.
  • Which of these stars has the largest radius?
  • Which of these stars does not have fusion occurring in its core?
  • Which of these stars has the coolest surface temperature?
  • Which of these groups of particles has the greatest mass?
The Sun would be a white dwarf.
  • What would stars be like if hydrogen had the smallest mass per nuclear particle?
  • What would you be most likely to find if you returned to the solar system in 10 billion years?
  • What would happen to a neutron star with an accretion disk orbiting in a direction opposite to the neutron star's spin?
  • What would happen if the Sun suddenly became a black hole without changing its mass?
Particles from the Sun pose the greatest hazard.
  • Which of these black holes exerts the weakest tidal forces on an object near its event horizon?
  • Which of these things poses the greatest hazard to communications satellite?
  • Which of these isolated neutron stars must have had a binary companion?
  • Which of these stars has the coolest surface temperature?
A supergiant M star has the largest radius.
  • Which of these stars has the longest lifetime?
  • Which of these stars has the largest radius?
  • Which of these stars is the most massive?
  • Which of these stars has the coolest surface temperature?
Changes in the organization of the Sun's magnetic field.
  • What causes the cycle of solar activity?
  • Which of these stars has the largest radius?
  • Which of these star clusters is oldest?
  • Which of these stars is the most massive?
...photons.
  • Scientists estimate the central temperature of the Sun using...
  • Stars can form most easily in clouds that are...
  • At the center of the Sun, fusion converts hydrogen into...
  • Solar energy leaves the core of the Sun in the form of...
An isolated pulsar that pulses 600 times per second.
  • Which of these isolated neutron stars must have had a binary companion?
  • Which of these black holes exerts the weakest tidal forces on an object near its event horizon?
  • Which of these stars has the coolest surface temperature?
  • Which of these things poses the greatest hazard to communications satellite?
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