SpaceX's Falcon Heavy rocket has been in the works for so long that it almost feels like the stuff of legend at this point (Elon Musk first unveiled it in 2011), but there are signs that it might make that promised November launch. The private spaceflight outfit has just finished testing Heavy's three first stage cores at its McGregor, Texas facility, ending a cycle that began in May. It's not as dramatic as an actual launch, of course (the image you see above is just a conceptual render), but it's an important step toward prepping the rocket for its debut.