فوياجر 1 بالسرعة التي ابتعد بها خلال السنة حتى 2026-10-25 (JPL Horizons). القيادة: دون توقف، ودون التزود بالوقود أبدًا.
حقائق
تتراوح درجة حرارة الاتزان للكوكب K2-3 d بين −50 و+50 °س.
كيف اكتُشف
اكتُشف أول كوكب عام 2015 بطريقة العبور (أرشيف ناسا للكواكب الخارجية).
كواكبه
K2-3 b — 2.1 times Earth's width, a 'sub-Neptune' — bigger than Earth, smaller than Neptune; its year lasts 10 days; about 230 °C, hotter than boiling water; found in 2015 by transit.
K2-3 c — 1.6 times Earth's width, about Earth-sized — probably rocky; its year lasts 25 days; about 99 °C, between freezing and boiling; found in 2015 by transit.
K2-3 d — 1.5 times Earth's width, about Earth-sized — probably rocky; its year lasts 45 days; about 32 °C, between freezing and boiling; found in 2015 by transit.
NASA Exoplanet Archive, Planetary Systems Composite Parameters (fetched 2026-11-02). Composite values: where a planet's size or mass was not measured, the archive estimates it from the other.
This research has made use of the NASA Exoplanet Archive, which is operated by the California Institute of Technology, under contract with NASA under the Exoplanet Exploration Program.