If the Sun collapsed to a neutron star or black hole, Earth would
1) spiral into the Sun's core,
2) remain in its present orbit,
3) spiral away from the Sun,
4) itself undergo collapse,
for the variable that changes in Newton's gravitational equation is
5) distance.
6) the mass of the Sun.
7) the mass of Earth.
8) all of these.
9) none of these.
Answer: 2, 9
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