Question: How Many Spaces Go After a Period?

Answer:

Use just one space after a period.

If you grew up using a typewriter, you were probably taught to put two spaces after a period. But like the typewriter itself, that custom went out of fashion many years ago.

With modern word-processing programs, a second space is not only inefficient (requiring an extra keystroke for each sentence) but potentially troublesome: it can cause problems with line breaks.

In most cases, computers use proportional fonts so that a single keystroke creates the proper space between sentences. And there's no evidence that an extra space makes a document any easier to read.

Of course, if you're still using a typewriter, feel free to continue putting two spaces after a period. And don't forget to change the ribbon now and then.