A white dwarf is
A) what most stars become when they die.
B) a precursor to a black hole.
C) an early stage of a neutron star.
D) a brown dwarf that has exhausted its fuel for nuclear fusion.
A) what most stars become when they die.
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Why might it be difficult for Earth-like planets to form around Sun-like stars in the inner parts of the disk of our galaxy?
A) any stars would be sucked into the central supermassive black hole B) there would be insufficient amounts of heavy elements C) the stars would be packed together too densely for planets to be stable D) there would be too much harmful radiation
When a well is drilled into an aquifer, why does water flow out of the well spontaneously?
What will be an ideal response?
The figure above shows how the luminosity of supernovae changes over time. About how long does it take a white dwarf supernova to decrease in luminosity by a factor of 100 from its peak?
A) 300 days B) 200 days C) 100 days D) 25 days
What is the magnitude of the magnetic field at point P if a = R and b = 2R?
A.
B.
C.
D.
E.
