Which of the following statements is true of coronal holes?
A) Open magnetic fields allow ionized gas to flow away as the solar wind.
B) Reconnection events prevent the release of ionized gases outward from the corona.
C) Discharge of solar materials is prevented because the region is extremely thick.
D) Magnetic field loops back into the Sun to trap the solar wind.
A
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Which of the following observations would not be likely to provide information about the final, explosive stages of a star's life?
A) decades of continuous monitoring of red giants in a globular cluster B) studying the light rings around Supernova 1987A in the Large Magellanic Cloud C) observing the structures of planetary nebulae D) neutrino detections from nearby supernovae
In the Lighthouse Model,
A) the star literally turns on and off like a lighthouse beacon. B) all pulsars must have their poles pointed directly toward us. C) if the beam sweeps across us, we will detect a pulse of radiation. D) the period of pulsation must speed up as the neutron star continues collapsing. E) the period of pulsation slows down due to the drag of the remnant on its field.
Where do the names for the moons of Mars (Phobos and Deimos) come from?
A) the founders of Rome B) the twins depicted in the constellation Gemini C) the names of their discoverers D) the sons of Ares and Aphrodite E) the names of the dogs of Orion
During which of the following phases of life is a star's pressure and gravity out of equilibrium?
A) main sequence B) helium core fusion C) white dwarf D) red giant E) A star is never out of equilibrium.