SpaceX is scheduled to launch a rocket Tuesday . The unmanned Dragon capsule will be the first of its kind and carry about 5,500 pounds (2,200 kilograms) worth of supplies for NASA. Those tests showed that the rocket is capable of reducing its speed from hypersonic to nearly zero , and deploy landing legs . There is at best a 50 % chance this attempt will succeed , SpaceX says .
SpaceX is scheduled to launch a rocket Tuesday . The unmanned Dragon capsule will be the first of its kind and carry about 5,500 pounds (2,200 kilograms) worth of supplies for NASA. There is at best a 50 % chance this attempt will succeed , SpaceX says .