A unit of length equal to the distance that light travels through space in one year.

• Leap Year

• Light-Year

• Frequency

The change in wavelength that allows us to determine if an object if moving toward us or away from us

• Whiteshift and Blueshift

• Redshift and Greenshift

• Redshift and Blueshift

Visible light emitted from a star or galaxy can be separated into a band of colors, called a ________.

• Spectrum (or spectral lines)

• Microwave

• Radiation

As galaxies move away from our galaxy

a shift on the electromagnetic spectrum is noticed. This phenomena is

called _____________.

• redshift

• blueshift

What does the Big Bang theory suggest?

• The universe was just there
• The Milky Way is the only solar system
• The universe is continually expanding
• The universe is collapsing in toward a single point

Why is the light from distant galaxies red-shifted?

• They produce more red light than nearby galaxies

• They are moving away from us

• The longer wavelengths are filtered out more by dust

• They are moving toward us

How is the "Big Bang" described?

• an explosion

• an expansion

• a contraction

In relation to us, most galaxies are…

• Moving toward us

• Moving away from us

• Not moving

The change in wavelength of light or sound that is due to the relative motion of the source towards or away from an observer.

• Radar Effect
• Doppler Effect
• Light Effect
• Reflection

What is true about these stars?

• Both of these stars are moving away from us.

• Both of these stars are moving towards us.