According to the nebular theory, how did the asteroid belt form?
A) It is made of planetesimals that formed beyond Neptune's orbit and never accreted to form a planet.
B) It is made of planetesimals between the orbits of Mars and Jupiter that never formed into a planet.
C) It consists of objects that fragmented from the protosun during a catastrophic collision early in the formation of the solar system.
D) It is made of planetesimals formed in the outer solar system that were flung into distant orbits by encounters with the jovian planets.
E) It is material left over from the interstellar cloud that never contracted with the rest of the gases to form the solar nebula.
Question 2
An O-star has a hotter surface temperature than the Sun. Therefore, compared to the Sun,
A) its emission peaks in the infrared part of the spectrum.
B) its emission peaks in the blue part of the spectrum.
C) it emits at about the same wavelengths as the Sun (similar peak) but it is much brighter.
D) it emits at about the same wavelengths as the Sun (similar peak) but it is much fainter.
The endosymbiosis theory
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