Live coverage: Ariane 5 blasts off with two Intelsat satellites

Arianespace announced this week it is organizing a contest open to startups, labs, and universities for a free launch of a nanosatellite on a future rideshare mission, likely on an Ariane 6 or Vega rocket.

A massive radio broadcasting satellite for SiriusXM is set for liftoff Friday on top of a Falcon 9 rocket, punctuating a busy week for SpaceX that included the debut of a new-generation cargo ship for the International Space Station and a spectacular atmospheric test flight of a prototype rocket over South Texas.

SpaceX and Arianespace recently announced plans to launch rideshare missions to sun-synchronous and geostationary orbit, dedicating big rocket capacity for small satellites as the U.S.-based launch broker Spaceflight committed to using a new Indian microsatellite launcher set to debut later this year.