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A rocky body between the orbits of Mars and Jupiter is an ________.

A featureless spectrum, such as a rainbow, is said to be __________ .

A fatal flaw with Ptolemy’s model is its inability to predict the observed phases of:

According to the Zeeman effect, the splitting of a sunspot’s spectral lines is due to

In addition to revolving around the Sun counter clockwise, most planets also rotate on their axis counter clockwise.

_________ is the only planet with a mean density less than water.

Radio waves, visible light, and X-rays are all types of electromagnetic radiation.

Medium A blocks more of a certain wavelength of radiation than medium B.  Medium A has a higher

Which of the following does not fall into the category of interplanetary debris?

Electromagnetic forces can be either attractive or repulsive.