A
fusion rocket is a theoretical design for a
rocket driven by
fusion power which could provide efficient and long-term
acceleration in space without the need to carry a large fuel supply. The design relies on the development of fusion power technology beyond current capabilities, and the construction of rockets much larger and more complex than any current
spacecraft. A smaller and lighter fusion reactor might be possible in the future when more sophisticated methods have been devised to control magnetic confinement and prevent
plasma instabilities.
Fusion power could provide a lighter and more compact alternative.