Watch a live view of SpaceX’s Cape Canaveral launch pad (members only)

The launch of a Soyuz rocket from French Guiana with four more satellites Thursday to join SES’s O3b broadband network will help satisfy growing bandwidth demands in Latin America, Africa and the Pacific islands until the deployment of a new generation of upgraded spacecraft in 2021, SES officials said.

On the eve of launching its first ViaSat 3 internet satellite on a SpaceX rocket, Viasat says it has moved the launch of an identical spacecraft off of Europe’s long-delayed Ariane 6 rocket, and is considering bids from other rocket companies.

A critical test firing Saturday of the four main engines powering the first stage of NASA’s gargantuan Space Launch System moon rocket is the final major hurdle before the fully assembled booster’s costly, oft-delayed launch late this year on an unpiloted test flight.