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WHAT IS SPACE
You might think space is an empty container, a whole lot of nothing. At the most, it's the distance between things that are really something, but now, concepts have to get a little weirder. In this section, we have to introduce two terms thrown around in Relativity circles, space-time and the fourth dimension.
To start with, we'll pick a point on a piece of paper.
That's no dimension. Now we'll draw a five-inch line starting at this point.
That's one dimension. Next, we'll make another five-inch line at right angles to the line starting at the same point.
That's two dimensions. So far, these can define a square. The formula for the square is 52 = 25 meaning five times itself equals twenty-five or five squared equals twenty-five. The square is twenty-five square inches in size. We'll have to imagine the next line because we can't put it on that paper. It's another five-inch line from that point upwards from the paper at right angles to the other two lines.
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