An abbreviation is a shorter way of writing or saying a word or phrase. "NASA" is an abbreviation of the words "National Aeronautics and Space Administration"
rocket is an object that can be sent into space for science experiments. NASA sent the rocket into the sky for its 5th mission. When something is rocketing
time ever since. (transitive) If you retire something, you stop using it. NASA will soon be retiring the space shuttles. (intransitive) If you retire, you