When Falcon Heavy lifts off this afternoon, it will be the most powerful operational rocket in the world by a factor of two. With the ability to lift into orbit nearly 64 metric tons (141,000 lb)—a mass greater than a 737 jetliner loaded with passengers, crew, luggage, and fuel—Falcon Heavy can lift more than twice the… Continue reading Falcon Heavy is scheduled to launch today; it won’t be on NASA TV. Here’s how to watch.