Understanding the different properties of a star in the upper and lower part of the main sequence. - Consider a star at the upper part of the main sequence (label it star A) and a star in the lower part of the main sequence (label it star B). Which is: a. Larger? b. More luminous? c. More massive? d. Hotter?

Explanation on how the sun produces energy by nuclear fusion. - Explain how the sun produces energy by nuclear fusion.

Compare the stars found in the galactic disk - Compare the stars found in the galactic disk (where the sun is located), also known as Population I stars, with the stars in the halo of our galaxy, known as Population II stars. **** Minimum 100 words - Cite all sources / urls

The Big Bang theory of cosmology and its evidence. - What observational evidence supports the Big Bang theory of cosmology? Explain.

Understanding where the Sun's energy comes from. - Why do astronomers infer that the Sun's energy comes from nuclear fusion reactions? How do we know it does not come from chemical burning?