The energy of a main sequence star comes from:

The light-sensitive part of the eye on which an image must fall is the

Scientific notation is shorthand for;

A triangular piece of glass or other material that divides white light into a rainbow of colors is

Ptolemy is known for his

A specially designed piece of glass or plastic used for viewing is a

The number of cycles completed per unit time is called

 Tycho Brahe:

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An elongated celestial object containing a coma, nucleus, tail, and a hydrogen cloud is a (an):