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Is a cubic light year a cube of time?
No. A light year is a measure of distance, not time; it is the distance that light travels in a year. So a cubic light year is a measure of volume, rather like a cubic foot or cubic meeter only much larger.
What has mass but no volume?
Light has mass but no volume. Although light particles called photons have energy and momentum which contribute to their mass, they are considered massless particles because they have zero rest mass and do not occupy physical space.
What results from wavelengths and frequencies of light and sound?
Wavelengths and frequencies of light determine the color and intensity of light. For sound, wavelengths and frequencies determine the pitch and volume of the sound.
Gases have ..?
Gases have no definite volume or shape. The air that you breathe, the helium in a balloon, and the neon inside the tube in a neon light are gases.
How many square miles are in a cubic light year?
You seem to be asking me to compare surface area to a volume; this doesn't generally make sense.
