8.1.1 Formation of the Solar System

• The Nebula Theory proposes that the solar system originated from a giant cloud of gas and dust
• What happens to the nebula during gravitational collapse according to the Nebula Theory?

  It spins and flattens
• Match the stages of the Nebula Theory with their descriptions:

  Gravitational Collapse ↔️ The nebula collapses and forms a disk-like shape

  Accretion ↔️ Material in the disk gathers to form the Sun and planets

  Protoplanetary Disk ↔️ A rotating disk forms around the Sun, leading to planet formation
• What is the protoplanetary disk in the Nebula Theory?

  A spinning, flattened disk
• What role does energy from nuclear fusion play in the formation of the protostar?

  Provides outward pressure
• Where did the gaseous planets form in the protoplanetary disk?

  Outer, cooler regions
• The rocky planets formed in the inner, hotter regions of the protoplanetary disk from solid dust and rocky material
• What is the Nebula Theory?

  Solar system formation
• Stages of the Nebula Theory in chronological order

  1️⃣ Gravitational Collapse

  2️⃣ Accretion

  3️⃣ Protoplanetary Disk
• As the nebula collapses under its own gravity, it spins and flattens into a protoplanetary disk
• What marks the birth of a protostar?

  Nuclear fusion
• What is the primary process that leads to the formation of planets in the protoplanetary disk?

  Accretion
• The composition and location of material in the protoplanetary disk determined the type of planets that formed.


  True
• The outward flow of charged particles from the Sun's surface, known as the solar wind, cleared much of the remaining gas and dust in the protoplanetary disk.
• What is the Nebula Theory widely accepted for explaining?

  Formation of the solar system
• The gravitational collapse of the nebula caused it to spin and flatten into a disk-like shape.


  True
• The protoplanetary disk formed around the Sun eventually coalesced into the planets
• Gravity is the force that pulls the nebula together during gravitational collapse.


  True
• Nuclear fusion in the core of the protoplanetary disk marks the birth of the protostar
• Rocky planets formed in the inner, hotter regions of the protoplanetary disk.


  True
• What led to the distinct formation of the rocky and gaseous planets in our solar system?

  Composition and location
• The location and composition of the protoplanetary disk influenced the formation of the rocky and gaseous planets.


  True
• During the gravitational collapse stage of the Nebula Theory, the nebula spins and flattens into a disk-like shape
• What is the first key stage in the formation of the solar system according to the Nebula Theory?

  Gravitational Collapse
• The protoplanetary disk is a precursor to the formation of the Sun and planets.


  True
• The release of energy from nuclear fusion in the protostar's core counteracts the inward pull of gravity
• Match the planet type with its formation material:

  Rocky Planets ↔️ Solid dust and rocky material

  Gaseous Planets ↔️ Gas and ice
• Which type of planets formed from solid dust and rocky material in the inner regions of the protoplanetary disk?

  Rocky Planets
• The clearing of the protoplanetary disk allowed the planets to settle into stable orbits around the Sun.

  True