Stars, Galaxies, and the Universe

Proxima Centauri is the closest star to Earth after the Sun and is located 4.3 light years away from Earth. How long does it take light from Proxima Centauri to reach Earth?

• 1 year
• 4.3 years
• 43 years
• 10 trillion years

A scale diagram of four galaxies is provided. Which galaxy has a diameter closest to 75,000 light years?

• Galaxy JK23
• Galaxy TO37
• Galaxy RB17
• Galaxy WD28

What type of wave has the smallest wavelength out of the choices below?

• Radio
• X-ray
• Gamma
• Visible Light

What is the weakest type of radiation?

• Visible light
• Ultraviolet 
• Gamma 
• Radio

Which type of radiation has the least amount of energy?

• Visible light
• Ultraviolet 
• Gamma 
• Radio

In the diagram given, what happens as we move to the left?

• Stars Get Larger
• Stars get Colder
• Stars get hotter

The category that contains the most stars is...

• Main Sequence
• Supergiants
• Giants

Compared to the rest of the stars, our sun is considered...

• Extremely Large and Cold
• Small with a medium temperature
• Medium size with medium temperature

In relation to us, most galaxies are…

• Moving toward us
• Moving away from us
• Not moving

Which piece of evidence supports the Big Bang theory?

• The more distant galaxies are moving the slowest
• The more distant galaxies are moving the quickest
• The more distant galaxies are moving towards us
• Galaxies and space is not changing