Spaces Following a Period
In word-processed documents, two spaces traditionally follow a sentence-ending period. In documents destined for typesetting, however, ordinarily only one space appears after sentence-ending punctuation.
Modern style manuals are changing the two-space rule, however. Here's the answer to this frequently asked question at the website of the Modern Language Association: "How many spaces do I put after a period?" MLA.org.
Publications in the United States today usually have the same spacing after a punctuation mark as between words on the same line. Since word processors make available the same fonts used by typesetters for printed works, many writers, influenced by the look of typeset publications, now leave only one space after a concluding punctuation mark. In addition, most publishers' guidelines for preparing a manuscript on disk ask authors to type only the spaces that are to appear in print.You should take a word-processed document, and globally replace all "two spaces" with "one space." Then print it out. We think you'll prefer the new, more modern one-space rule.
Because it is increasingly common for papers and manuscripts to be prepared with a single space after all punctuation marks, this spacing is shown in the examples in the MLA Handbook and the MLA Style Manual. As a practical matter, however, there is nothing wrong with using two spaces after concluding punctuation marks unless an instructor or editor requests that you do otherwise. [Emphasis added.]
The Two-Space Typo
Further, all writers have made the following typo: two spaces within a single sentence. If you adopt the one-space rule, then you can globally replace all "two spaces" with "one space." That way you'll electronically remove all two-space typos.
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