Cancelled interstellar probes

study conducted by the British Interplanetary Society about a probe using a fusion rocket to reach Barnard’s Star

research and engineering project by Breakthrough Initiatives

interstellar spaceprobe

hypothetical autonomous artificially intelligent robotic interstellar probe seeking technological civilizations and communicate over short distances once it discovers one

proposed spacecraft intended to study the interstellar medium

study started in 2009 for the design of an interstellar space probe