Galaxies and the Universe

Why is it impossible to directly image the Milky Way Galaxy?

• We are inside the galaxy
• Our telescopes are not powerful enough
• The Milky Way is too far away
• The galaxy does not produce enough light

What is a "Variable Star"?

• A star that has exploded as a supernova
• It is the same as a protostar
• A star that changes in its luminosity over a specific duration of time
• A type of star that is unknown

What can variable stars be used for?

• To get an accurate measurement of distance
• To measure the speed of light
• To determine the composition of the Sun
• To figure out the age of the universe

Which type of variable star changes its period of pulsation in hours?

• RR Lyrae Variables
• Cepheid Variables

What is the diameter of the Milky Way Galaxy in light years?

• 1,000 LY
• 10,000 LY
• 100,000 LY
• 1 Million LY

What Shape is our Milky Way Galaxy?

• Elliptical

• Lenticular

• Barred Spiral

• Irregular

Approximately how many stars are in the Milky Way Galaxy?

• 2 Million

• 200 Million

• 2 Billion

• 200 Billion

What is at the center of the Milky Way Galaxy?

• A nebula
• A black hole
• A quasar
• An active galaxy

Where are Population I stars found?

• Nuclear bulge
• Halo
• Disk
• Globular clusters

Who discovered the first galaxy outside of the Milky Way?

• Edwin Hubble
• Isaac Newton
• Albert Einstein
• Neil Armstrong