Lesson 2.1: The Origin of the Solar System

Which hypothesis proposes that a cloud of gas and dust collapsed and flattened due to gravity, leading to the formation of the solar system?

• Nebular Hypothesis

• Planetesimal Hypothesis

• Tidal Theory

• Protoplanet Hypothesis

What is the key weakness of the Nebular Hypothesis?

• Difficulty in explaining initial trigger

• Inability to explain the diversity of planetary compositions

• Lack of evidence for protoplanetary disks

• Ignoring the role of gas giants in solar system formation

According to the Nebular Hypothesis, what role does conservation of angular momentum play in the formation of the solar system?

• It causes the solar nebula to contract

• It triggers nuclear fusion in the Sun

• It leads to the formation of planetesimals

• It causes the spinning solar nebula to flatten into a disk

The Planetesimal Hypothesis focuses on the idea that planets formed through the collision and coalescence of _______________.

• gas clouds

• protoplanets

• star clusters

• solid planetesimals

What evidence supports the Planetesimal Hypothesis?

• Observations of protoplanetary disks

• Observations of interstellar gas clouds

• Kuiper Belt and Asteroid Belt

• Presence of multiple stars in the solar system

Which hypothesis suggests that a passing star or external perturbation triggers the collapse of a diffuse gas cloud, leading to star and planetary system formation?

• Nebular Theory

• Planetesimal Hypothesis

• Tidal Theory

• Protoplanet Hypothesis

What is a major weakness of Tidal Theory?

• It fails to explain the role of external influences.

• It doesn't address the presence of interstellar gas clouds.

• It is too complex to understand.

• It lacks a clear mechanism for protostar formation.

According to the Protoplanet Hypothesis, what are protoplanets?

• Early-stage stars

• Solid planetesimals

• Gas giants

• Regions of higher density that form planets

What does the Protoplanet Hypothesis emphasize as crucial in forming planets?

• Gas clouds

• The role of gas giants

• Planetesimals and their collisions

• External tidal forces

Which hypothesis is known for its ability to explain the diversity in planetary compositions?

• Nebular Hypothesis

• Planetesimal Hypothesis

• Tidal Theory

• Protoplanet Hypothesis