Watch a Falcon 9 rocket fire its engines Tuesday at pad 39A

SpaceX’s proposal to land astronauts on the moon using the company’s reusable Starship vehicle could be “game-changing” for space exploration, but comes with risks and complexity that “threaten the schedule viability” to achieve NASA’s goal of returning crews moon by the end of 2024, agency officials said.

SpaceX and SES, an international communications satellite operator based in Luxembourg, have agreed to place the SES 10 television relay craft aboard the first launch of a reused “flight-proven” Falcon 9 rocket from Cape Canaveral as soon as October, the companies announced Tuesday.

Two days after launching from Cape Canaveral with nearly 5,500 pounds of supplies and experiments, an automated SpaceX Dragon cargo craft approached the International Space Station Monday. The Dragon supply ship was grappled by the station’s robotic arm at 7:01 a.m. EDT (1101 GMT).