SpaceX has now successfully landed three rockets from space—one by land and two by sea. That has given the company quite a collection of boosters in its Hangar 39A at Cape Canaveral in Florida.

This weekend, the rocket company released some photos of the three boosters together after the Falcon 9, which delivered a Japanese communications satellite transfer orbit some 35,786km above the Earth earlier this month, was towed back to the Florida coast and brought into the hangar. This success led Musk to muse on Twitter: “May need to increase size of rocket storage hangar.”

These three landings have marked an important step toward a key goal of SpaceX and other new space companies—reusability. This would completely remake the economics of spaceflight because launch costs are driven by hardware, not propellants. The cost to fuel a Falcon 9 rocket with liquid oxygen and kerosene propellant is about $ 200,000, Musk said. The company’s commercial launch price is $ 61 million.