They're targeting July 1st for the wet dress rehearsal (fueled up, practice countdown) and launch soon after. The test stand at their McGregor Texas facility is nearing completion, and the 3 cores (center core and 2 liquid fueled boosters, all based on Falcon 9R) are under construction at Hawthorne, California. Falcon Heavy will be the most powerful rocket on Earth, capable of sending 53,000 kg to low Earth orbit, 21,200 kg to geostationary orbit, or 13,200 kg to Mars. 53,000 kg is