Universe & Solar System Formation

What is the approximate age of our solar system?

• 4.6 billion years

• 460 million years

• 46 billion years

• 13.8 billion years

Which theory explains how the universe formed?

• nebular theory

• big bang theory

• raisin bread theory

• theory of relativity

Which theory explains how our solar system formed?

• nebular theory

• big bang theory

• gravitational theory

• theory of spontaneous generation

Balls of ice, snow, rock, and dust that orbit the sun in very oval orbits...

• asteroids

• planetismals

• comets

• meteoroids

A nebula starts to collapse because of:

• A nearby star shining it's light
• A passing spaceship
• A passing comet
• Gravity

As a nebula collapses it also begins to

• expand

• rotate

• shake

• turn to ice

A nebula collapses down into

• a compact disc

• an irregular cloud

• an accretion disk

• a circular disk

What forms in the very center of the accretion disk?

• A sun

• A planet

• A dwarf planet

• A planetesimal

What is forming in the accretion disk away from the center?

• Light
• Protostars
• Planetesimals
• Hydrogen

The planetesimals keep:

• Colliding and breaking apart
• Colliding and sticking together
• Colliding and bouncing around
• Breaking down into smaller pieces