Video: Liftoff of Atlas 5 rocket with Mexico’s Morelos 3

China’s heaviest rocket has rolled to its launch pad for liftoff Thursday with the country’s first Mars landing mission, an ambitious attempt to place an orbiter around the Red Planet and a robotic rover on the Martian surface in early 2021.

Vaulting away from Cape Canaveral on an unusual southerly trajectory, a Falcon 9 rocket dodged stormy weather and successfully placed an Argentine radar observation satellite into an orbit over Earth’s poles Sunday on SpaceX’s 100th launch.

Relativity Space will try a third time to launch a 3D-printed rocket from Cape Canaveral Wednesday night, and weather forecasters predict a 95% chance of favorable conditions for the late-night test flight.