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If you heat a gas so that collisions are continually bumping electrons to higher energy levels, when the electrons fall back to lower energy levels the gas produces 

X-rays from astronomical objects can only be detected from telescopes in space.

Given the following generic chemical reaction, which is the product? X → Y

Which of the following is not a conserved quantity? 

What is granulation in the Sun? 

Based on the information given in the following diagrams, which substance has the lower boiling point: one made from molecule A or one made from molecule B?

What layer of the Sun are we seeing in this photograph, and in what wavelength band was it photographed?

What is an astronomical unit? 

From shortest to longest wavelength, which of the following correctly orders the different categories of electromagnetic radiation? 

What would happen inside the Sun if a slight rise in core temperature led to a rapid rise in fusion energy?