TOKYO -- The Japan Aerospace Exploration Agency looks to take a page out of SpaceX's book when developing its next mainstay rocket by adopting a format allowing for flexible and continuous upgrades to the launch vehicle.
'Block upgrades' to slash development time for successor launch vehicles

An artist's rendering of Japan's H3 rocket. (Image courtesy of JAXA)
TOKYO -- The Japan Aerospace Exploration Agency looks to take a page out of SpaceX's book when developing its next mainstay rocket by adopting a format allowing for flexible and continuous upgrades to the launch vehicle.