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An absorption spectrum is also called a bright-line spectrum.

As Earth rotates, circumpolar stars appear to move counterclockwise around the north celestial pole.

The total amount of illumination changes during the lunar cycle of phases.

In the Northern Hemisphere, the sunlight moves from right to left across the surface of the Moon during the waxing phases.

Astronomy is pseudoscience.

Earth’s atmosphere is fully transparent only to visible and radio light.

An observer at Earth’s geographic north pole would find _______

When two objects of unequal masses orbit each other, the center of mass is

Ptolemy’s model of the universe

Galileo’s telescopic discovery of moons orbiting Jupiter was important because it showed that