Elon Musk's SpaceX is set to conduct a round-the-world test flight of Starship, its biggest and mightiest rocket yet, designed to ferry people to the moon and Mars, and capable of lifting up to 250 tons and accommodating 100 people on a trip to Mars. Starship sports 33 main engines and 16.7 million pounds of thrust, accounts for 164 feet of height and could launch satellites into low-Earth orbit.