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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?

This figure shows idealized thermal radiation spectra from several stars and a human. Based on this graph, at about what wavelength does a 15,000 K star emit its most intense light?

LIGO detected gravitational waves that probably originated from:

The fact that the Voyager spacecraft continue to speed out of the solar system, even though its rockets have no fuel, is an example of