Scientists say the Voyager 1 spacecraft is near the outer limit of the solar system, 26 years after its US launch. The boundary is a region called "termination shock" where particles from the sun begin to slow down and clash with atomic matter from deep space. Nasa says Voyager 1 is about 13.5bn kilometres from Earth and will not reach another system for 40,000 years. The spacecraft carries greetings in 55 languages and audiovisual materials depicting life on Earth. Beyond the ever-shifting termination shock boundary, lies a region called the heliopause, that marks the beginning of interstellar space. Whether Voyager 1 has reached the first boundary or is still on approach remains unclear as, scientists provided evidence for both possibilities on Wednesday.

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