Why is my 4 minute video over 11 gigabytes? 10 PTS BEST ANSWER?

im making a project for my english class, and after filming and editing in adobe after affects and final cut pro, i rendered it all out and exported to a .mov file. now its on my desktop, a .mov, but its 11 gigabytes! and its only 4:40! PLEASE HELP, this is due tomorrow! thanks!