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All planets lie in orbits close to the ________ plane.

Knowing the peak emission wavelength of a blackbody allows you to determine its __________ .

The smallest planet, Mercury, has no moons.

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.