What observation made of other stars seems to suggest the solar nebula theory is correct?
a. Stars are found to exist more often in binaries than by themselves.
b. Protostars are seen to radiate much of their light at infrared wavelengths.
c. Nearby stars tend to be low-mass red dwarfs.
d. Young stars are found to have hot disks that surround them.
Question 2
The solar nebula theory is NOT able to explain which of the following observed characteristics of the solar system?
a. common direction of rotation of the planets
b. common direction of revolution of the planets
c. the formation of hydrogen atoms in the solar system from subatomic particles
d. the density of the Jovian planets
