6.78 = 6.8
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3.9
Well, honey, 678 is divisible by 1, 2, 3, 6, 113, 226, 339, and 678. So, take your pick! Just don't come crying to me if you pick the wrong one and end up with a remainder.
It is a decimal fraction.
They are dense in that between any two decimals you have another one. A much better way to think of it is that a decimal must be either rational or irrational. For example, .34 is certainly rational, but the decimal expansion of square root of 2 goes on forever and is irrational. So a decimal, being either one, must be dense in the reals.
A "Light year" is a distance. It's the distance light travels in one year, in vacuum.5,878,450,000,000 miles (rounded)9,460,450,000,000 kilometers (rounded)