SpaceX will today attempt to launch its largest rocket yet, the Falcon Heavy.

An upgraded version of the Falcon 9 rocket the spaceflight company has been flying for over two years now, the latest addition to the SpaceX arsenal will be capable of lifting more payload to orbit than any rocket today. The launch is set for sometime between 1:30 and 4:00 p.m. Eastern today.

The payload will is a red Tesla roadster (playing David Bowie’s “Space Oddity,” naturally), and the SpaceX CEO says i