Nuclear propulsion: Could nuclear engines transform deep-space exploration?
Nuclear propulsion is being explored as a potential successor to chemical rockets for deep-space exploration, offering higher energy density and efficiency. While promising for missions to Mars and beyond, the technology faces significant engineering and safety hurdles.
Why it matters
Advancements in nuclear propulsion could drastically reduce transit times for human spaceflight and enable more ambitious exploration of the solar system.
For decades, spacecraft have relied largely on chemical rockets to make the major manoeuvres needed to leave Earth and travel between planets. That approach has enabled missions across the Solar System, but it comes with a fundamental limitation: carrying the large quantities of fuel and oxidiser required for high-thrust propulsion adds mass and constrains what a spacecraft can do.
Nuclear propulsion is being investigated as one way to break that constraint. NASA is developing both nuclear thermal propulsion (NTP) and nuclear electric propulsion (NEP), while the European Space Agency (ESA) has recently completed studies examining nuclear systems for missions to the Moon, Mars and beyond.
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