Week 4 Astronomy CFU

Unit of measurement in space that we use inside of our solar system. Equal to the distance from the Sun to Earth (150,000,000 km).

• light-year
• astronomical unit
• mile
• yard

Due to Kepler's Laws, the Sun is not centered in our orbit. This causes us to experience times when we are closer and farther from the Sun. What is the name of the elongated orbit?

• Oval
• Eclipse
• Ellipse
• Circle

Earth revolves every ________ and rotates every ________.

• 24 hours; 365 1/4 days
• 365 1/4 hours; 24 days
• 365 1/4 days; 24 hours
• 24 days; 365 1/4 hours

The theory that an initial explosion resulted in the formation and expansion of the universe.

• Big Bang Theory
• Solar Nebula Theory
• Ejected Ring Theory

The theory that a cloud of gas and dust results in the formation of a solar system.

• Big Bang Theory
• Solar Nebula Theory
• Ejected Ring Theory

Why do we experience a leap year?