Live coverage: Ariane 5 blasts off with two Intelsat satellites

Relativity Space, a small launch startup aiming to fly its orbital rocket from Cape Canaveral for the first time next year, announced Wednesday it has signed a contract with Iridium for up to six launches of the company’s spare communications satellites. Relativity also announced it plans to develop a second launch pad at Vandenberg Air Force Base in California to allow for missions to polar orbits.

Rocket Lab’s light-class Electron launcher is set to take off on its seventh flight from New Zealand, aiming for a 280-mile-high (450-kilometer) orbit with seven small satellites for commercial customers, the U.S. military and university students.

A Japanese H-2A rocket took off Tuesday with a communications satellite to relay messages and commands among the country’s defense forces, part of a $1.1 billion program to reduce Japan’s reliance on commercial and international providers to connect its military units.