SpaceX to launch 64 satellites

A bit of space history today. SpaceX is set to deploy 64 satellites with a single launch this afternoon from Vandenberg Air Force Base in California with rocket that has been previously used on two occasions. This will be the first time that a rocket booster will be used for a third time. Also, this will be SpaceX's 19th launch this year, the largest number of launches in the company's history.