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If a star is circumpolar from a given location that means that the star is above the horizon all night but not during the day.

Because the celestial sphere is not real, it is not a good scientific model.

The ___________ of a gas is a measure of the average speed of the particles in the gas.

What phases would Venus show if the geocentric model were correct?

What are “failed stars” that do not sustain regular hydrogen fusion but are capable of fusing deuterium?

What is the best current method for determining the luminosity of a nearby star?

If the average distance from an asteroid to the Sun is 2.0 times the average distance from Earth to the Sun, what is the period of that asteroid?

Astronomers call the side of the Moon that always faces away from the Earth the dark side of the Moon.

How would your mass change if you traveled to the Moon?

By Kirchhoff’s second law a low-density gas excited to emit light will do so at specific wavelengths and thus produce