Watch live coverage as two of the world's newest heavy-lift rockets lift off, potentially within minutes of each other.
First up is the launch of Europe's Ariane 6 from Kourou in French Guiana. Liftoff with Europe’s first MetOp Second Generation (MetOp-SG-A1) weather satellite is scheduled for 9:37 p.m. Kourou time (8:37 p.m. EDT / 0037 UTC).
That will be followed by a United Launch Alliance Vulcan rocket from Cape Canaveral in Florida. Liftoff on the USSF-106 national security mission from Space Launch Complex 41 is scheduled for 8:56 p.m. EDT (0056 UTC).
This is the third mission for both Vulcan and Ariane 6. Both rockets had their inaugural launches in 2024.
Commentary will be provided by Spaceflight Now's Will Robinson-Smith, starting approximately an hour prior to liftoff of the Vulcan rocket.