Neptune has been directly explored by one space probe, Voyager 2, in 1989. As of 2024[update], there are no confirmed future missions to visit the Neptunian system, although a tentative Chinese mission has been planned for launch in 2024.[1] NASA, ESA, and independent academic groups have proposed future scientific missions to visit Neptune. Some mission plans are still active, while others have been abandoned or put on hold.[citation needed]
Since the mid-1990s, Neptune has been studied from afar with telescopes, including the Hubble Space Telescope and the ground-based Keck telescope using adaptive optics.[2]
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