Sun calculation questions regarding setting and rising times, the number of degrees it travels in an hour, and differences between the summer and winter.

How many degrees does the sun travel in one hour? Roughly how long does it take for the whole disk of the sun to set, from the beginning of sunset to the end (ignoring atmospheric and seasonal effects)? Is the setting time, from beginning to end faster or slower in the summer than in the winter? Why?

Existence of Extraterrestrial life

What are the arguments for the Existence of Extraterrestial life? What points do proponents make as proof? What do the the opponents say to counter? Minimum 500 words cite all sources / urls used.

Understanding what electromagnetic waves are and comparing the different types of wavelengths.

Light is one form of electromagnetic radiation. What are electromagnetic waves and what other types are there besides light? Compare their wavelengths.

Light Spectrum

How can the temperature, composition and motion of an object be determined from its light spectrum. cite references & urls

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?