Trans-neptunski objekt (TNO), bilo koji objekt unutar Sunčevog sustava koji oko Sunca orbitirana na srednjoj udaljenosti većoj od Neptuna. Prvi takav objekt, patuljasti planet 134340 Pluton, otkriven je 1930. dok se na otkriće sljedećega, (15760) 1992 QB1, čekalo do 1992.
- Nine planets, University of Arizona
- David Jewitt's Kuiper Belt site
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