The letters G U T  from the GUT Era stand for Grand Unified Theory. This theory explains how 3 of the fundamental forces are indistinguishable. Which three forces does it describe?

About how long does it take for the Sun to orbit around the Milky Way one time?

The Planck Era refers to

Which type of star clusters are generally located in the Halo of the Milky Way Galaxy?

Edwin Hubble believed that galaxies morphed from one type into another. What is the name of the scheme he developed?

Which of the following is not a type of galaxy classification?

What is NOT considered to be approximately the same for each star in a cluster?

What type of star is our Sun? (Use the catagory we discussed in class to answer this question)

List the Spectral types in order of temperature from Hottest to Coolest.

The chromosphere of the sun has a distinctive red/pink color. Emission nebulae also have thisdistinctive color. What is the source of this red/pink appearance?