Whether sound light infrared or radio waves move around a space and often bounce off of surfaces in a process called reflection. The first wave you feel when an earthquake hits is a longitudinal wave -- this is called the primary wave or P-wave.
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The same is true of hyphens used in compound nouns.
What does the word light-year mean in science. In the second youre saying that something spanned nearly ten trillion kilometres. Although the P-wave is the fastest earthquake wave it. Saying It was a light year means something completely different from It was a light-year In the first case youre saying that nothing much happened that year.
B it uses light-years to talk about time but a light-year is a unit of distance. A television advertisement claiming that a product is light-years ahead of its time does not make sense because A it doesnt specify the number of light-years. C a light-year is an astronomically large unit so a product could not possibly be so advanced.
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