TY - JOUR T1 - Was Planet 9 captured in the Sun鈥檚 natal star-forming region? JO - Monthly Notices of the Royal Astronomical Society: Letters UR - http://eprints.whiterose.ac.uk/122603/ PY - 2017/11/01 AU - Parker RJ AU - Lichtenberg T AU - Quanz SP ED - DO - DOI: 10.1093/mnrasl/slx141 VL - 472 IS - 1 SP - L75 EP - L79 Y2 - 2025/05/23 ER -