The manner in which the large, outer planets formed in our solar system was MOST

Question

The manner in which the large, outer planets formed in our solar system was MOST likely the

A) gravitational condensation of hydrogen, helium, and dust in eddies or vortices in the outer solar nebula

B) gravitational condensation of hydrogen and helium gas, followed by the capture of planetesimals

C) accretion of planetesimals to form a core, followed by the gravitational capture of hydrogen and helium gas

D) accretion of cold planetesimals containing large quantities of hydrogen and helium.

In order to produce a crater, the object that strikes a planet must be larger than about:

A) one centimeter

B) half a meter

C) half a kilometer

D) 50 kilometers

What is the origin of many of the bodies in the Kuiper belt and the Oort comet cloud?

A) These bodies were part of the original solar nebula. Because they are so far from the rest of the solar system, these regions were undisturbed by the creation of the planets, and these objects have remained there ever since

B) These distant objects have been captured from interstellar space by the Sun’s gravitational pull

C) The gravitational forces from Jupiter and Saturn flung planetesimals from regions closer to the Sun out into these regions

D) Early in the history of the solar system, it is believed that these objects were pulled out of the Sun by a close encounter with a passing star.

Explanation / Answer

1. Accretion of solid planetesimals containg mostly rocky material followed by gravitational pull to form the core.

2. 50 km is the right answer. The object should be this much large to show any impact over the body. In other words it should be 10 to 20 times larger.

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