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Proposed by the British Interplanetary Society, this concept entails sending a probe to the nearby Barnard's Star. It would use fusion propulsion for a journey expected to last 50 years, utilizing pellets of deuterium and helium-3.

Although not originally aimed to be interstellar, Voyager 1's mission goals include studying the outer Solar System and beyond, eventually becoming the first human-made object to enter interstellar space. Uses a radioisotope thermoelectric generator for power.

The mission goal is to develop a proof-of-concept fleet of light-sail spacecraft, capable of making the journey to the Alpha Centauri star system, 4.37 light-years away, at 20% the speed of light. The technology involves ultralight nano-spacecraft, light sails propelled by Earth-based lasers.

An unmanned interstellar probe concept to explore Alpha Centauri, designed by NASA and the US Naval Academy. It would be nuclear-powered and aimed to reach the star system and send data back to Earth.