Term “evidence-based medicine” first published in 

On a standard Hertzsprung-Russell diagram, you would find red giant stars in the 

Two stars have the same absolute magnitude, and have a spectrum indicating they are main sequence stars.

Describe the fusion process in the Sun. Specifically, what material is needed as fuel, what temperature is necessary, and what chemical is the end product?

The outermost layer of the Sun’s atmosphere is the 

What is the Hubble classification of the Milky Way galaxy?

On a standard Hertzsprung-Russell diagram, you would expect to find the Sun in the 

Sunspots appear

You would find most emission nebula in the 

Globular clusters