Solar Nebular Theory

A nebula is primarily composed of what element?

• Hydrogen
• Helium
• Other hard elements
• Zinc

Nebula are mixtures of gases and what?

• clouds
• stars
• tiny particles
• dust

A giant sphere of glowing gases is a ___________

• Galaxy
• Light-year
• Star
• Magnitude

The sun is a planet.

• True
• False

the planets of the solar system formed as 

• the center of the gas cloud cooled
• planetesimals flattened into a rotating disk
• planetesimals collided into one another
• the sun absorbed extra gas and dust from the solar system

What force acted on the massive nebula to collapse it and eventually form our sun?

• electrostatic force
• strong force
•  weak force
• gravity

The universe is expanding and shrinking in size.

• TRUE

• FALSE

What is a galaxy?

• a solar system

• groups of planets, dust, and satellites held together by nuclear fusion

• many blackholes

• groups of single stars, star systems, star clusters, dust, and gas held together by gravity

the process that provides the sun with its energy

• solar flare
• Photosphere
• radiative zone
• nuclear fusion

Our galaxy is called the Milky Way and it is ______ in shape.