We expect a scientific theory to be able to make predictions that can be tested. Which of the following is a prediction of the nebular theory that has been verified by observations?
a. Large planets should have at least some moons that are larger than the smallest planets.
b. Planetary orbits should lie in approximately the same plane as the disk of the Milky Way Galaxy.
c. Earth-size planets should have fairly large moons.
d. Many stars should have planets.
Ans: d. Many stars should have planets.
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