Northrop's new robot satellite mechanic aims to keep satellites flying longer

A spacecraft built and operated by Northrop Grumman, called a Mission Extension Vehicle (MEV), this week unplugged from a communications satellite operated by Australian firm Optus, after more than a year spent attached to the satellite’s back to keep it in the right orbital position. The MEV is now leaving to make room for its replacement.

In July, four new Northrop spacecraft launched into orbit aboard a SpaceX Falcon 9 rocket, headed for targets around 27,000 miles above Earth. One is the Mission Robotic Vehicle (MRV), a satellite equipped with two advanced robotic arms developed by DARPA, the U.S. military research organization. The other three are Mission Extension Pods (MEPs) — smaller, simpler satellites that function as modular propulsion systems. In 2027, the MRV will use its robotic arms to attach one of the MEPs to the Optus satellite, a move expected to keep it in orbit for years to come.

Satellites typically fail when they run out of fuel, not because their computers or transceivers stop working. The Optus satellite launched in 2009 and was designed for a 15-year lifespan; if all goes well, it could now fly — and generate revenue — for another six years.

Cheaper launch costs and lower-cost components are making spacecraft repair missions viable. The goal is “a paradigm shift where we can see space as sustainable, with a more resilient architecture and infrastructure base where we can do things like spacecraft repairs, life extension, or even upgrades and maintenance of satellites,” said Cassie Wong, Northrop’s director of logistics and servicing.

Two MEVs are currently in orbit, launched in 2019 and 2020, which together have provided 10 years of life extension to three customers, including two Intelsat spacecraft and the Optus satellite. MEV-1 will now wait in a parking orbit for another customer, while MEV-2 stays attached to its Intelsat customer until 2030. The MRV model differs: satellite operators buy and own their MEPs, freeing the MRV itself to service more vehicles at a lower cost — a business model Wong hopes to extend to other missions, including defense customers given the number of expensive satellites in high orbits.

Why it matters

If in-orbit servicing becomes routine, it could reshape how operators plan expensive, large satellites — treating them as repairable long-term assets rather than disposable hardware destined for replacement once their fuel runs out.