An interstellar comet is a comet (or exocomet) located in interstellar space,
权威例句
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Stardust is an ambitious but low-cost mission to capture the first samples from a comet, as well as grains of interstellar dust, and return them to Earth.
BBC: Probe set for asteroid flyby
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It is expected to deliver microscopic samples from Comet Wild-2, which it will swoop near in 2004, as well as interstellar particles captured near the asteroid belt.
CNN: NASA's Stardust mission develops case of blurry vision