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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.

The ________ planets are large bodies in the outer solar system with compositions like the Sun’s.

Today which of these theories seems to best explain the Moon’s origin?

A dense, hot body will give off a(n) _________ spectrum.