A SpaceX Dragon capsule undocked from the International Space Station Thursday morning, and will return to Earth with experiments about the brain, muscles and liver. NASA said the experiments were designed to take advantage of microgravity aboard the space station. NASA said the spacecraft left the space station at 9:05 am. According to SpaceX, the Dragon capsule is the only spacecraft currently flying that's capable of returning significant amounts of cargo back to Earth. NASA says the spacecraft will make a parachute-assisted splashdown off the coast of Florida around 11 pm.