Creating mysql table with explicit default character set, what if I don't?

In mysql 5.x Whats the difference if I do something like this:

CREATE TABLE aTable (
    id                       BIGINT NOT NULL AUTO_INCREMENT PRIMARY KEY,
    aNumber          bigint(20) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARACTER SET=utf8;

with this:

CREATE TABLE aTable (
   id                       BIGINT NOT NULL AUTO_INCREMENT PRIMARY KEY,
   aNumber            bigint(20) DEFAULT NULL
) ENGINE=InnoDB CHARACTER SET=utf8;

Notice I am not specifying the character set as default in the first one. I couldn't find anything in the mysql docs.