What observation made of other stars seems to suggest the solar nebula theory is correct?

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

Question 3

Suppose that Mercury grew to its present size in 1 million years through the accretion of particles averaging 100 g each. On average how many particles did Mercury capture each second? Note: Mercury has a mass of 3.3 1023 kg and a radius of 2439 km.

a. about 24 particles per second
b. about 3.3 1021 particles per second
c. about 67 particles per second
d. about 100 million particles per second
e. about 100 billion particles per second

Question 4

The speed of the solar wind is approximately 400 km/s and the distance from the Sun to Saturn is 9.5 AU (1 AU = 1.5 108 km). How long does it take a particle in the solar wind to reach Saturn?

a. about 4.1 hours
b. about 4.1 days
c. about 41 days
d. about 4.1 years
e. about 41 years

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What observation made of other stars seems to suggest the solar nebula theory is correct?

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