Question

according to the nebular theory, what early event eventually led to the formation of our solar system?
a very large protoplanet exploded, resulting in the planets we know today.
the sun formed a nebula as its gravity pulled in more and more dust and gas.
a nebula began to collapse as a result of its own gravity.
the universe expanded and contracted, resulting in higher temperatures.

Explanation:

The nebular theory states that the solar system formed from a nebula (a cloud of gas and dust). The process began when the nebula started to collapse under its own gravity. This collapse led to the formation of the Sun at the center and the planets from the remaining material.

• Option 1: There is no scientific basis for a large protoplanet exploding to form planets.
• Option 2: The Sun formed from the nebula, not the other way around.
• Option 3: This aligns with the nebular theory.
• Option 4: The expansion and contraction of the universe in this context is not relevant to the formation of the solar system as per the nebular theory.

Answer:

A nebula began to collapse as a result of its own gravity.