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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

Match the planets to their pictures. [Image 1] [Image 2] [Image 3] [Image 4] [Image 5] [Image 6] [Image 7] [Image 8]  

Match the images of models of the Earth, Sun, Moon, planets, and stars with the historical astronomer who developed that model.  [Image 1] [Image 2] [Image 3]  

According to the giant impact hypothesis, how did the Moon form?