Which two moons have atmospheres?

What direction do the planets actually move in around the sun?

Which Spiral classification will have the most tightly bound arms?

We are located at 20° lat (relative to the North Celestial Pole), what is your Celestial Equator?

Star A is m= +8 and is 16x dimmer than star B, what is the m of star B? 

What sort of stars do irregular galaxies contain?

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What are unofficial constellations called?

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Regimes are comprised of both: