VERDICT: FALSE The specific factual claim — that K2-137 b has a ~7.9-hour (≈8-hour) "year" — is wrong. K2-137 b is a real, confirmed planet, and it is indeed an ultra-short-period rocky world baked by intense stellar radiation, but its orbital period is ~4.3 hours, not ~8 hours. The video's headline figure is off by nearly a factor of two, so the core claim as stated is false. CLAIM-LINKED FINDINGS: 1. **Claim: "K2-137 b completes an orbit around its star in roughly 7.9 hours" → FALSE.** The peer-reviewed discovery paper (Smith et al. 2018, Monthly Notices of the Royal Astronomical Society 474, 5523) states: "K2-137 b completes an orbit in only 4.3 h, the second shortest orbital period of any known planet, just 4 min longer than that of KOI 1843.03." NASA's Exoplanet Archive lists the orbital period as P = 0.179719 days = ~4.31 hours (Smith et al. 2018 solution). The claimed 7.9 hours does not appear in any primary source for this planet. 2. **Claim: "a year lasts just 8 hours" / "ultra-short-period" / "rocky planet" / "intense stellar radiation" → Partially accurate.** The planet itself is real: NASA Science confirms it is a terrestrial exoplanet orbiting an M-type star at 0.0058 AU, discovered in 2017, with an orbital period of 0.2 days (NASA's rounded catalog value ≈ 4.8 h — still not 8 h). The discovery paper confirms it is Earth-sized (0.89 ± 0.09 R⊕), iron-rich (iron mass fraction > 0.45), in an ultra-short-period orbit, with an equilibrium temperature of ~1471 K — so "rocky," "ultra-short-period," and "intense stellar radiation" are all accurate descriptions. Only the period value (7.9/8 h) is fabricated or conflated from another source (e.g., Kepler-78b's 8.5-h period). PRIMARY SOURCES: - https://science.nasa.gov/exoplanet-catalog/k2-137-b/ (NASA Exoplanet Catalog: period 0.2 days, terrestrial, 0.0058 AU, M-type star, 2017) - https://exoplanetarchive.ipac.caltech.edu/overview/K2-137 (NASA Exoplanet Archive: P = 0.179719 days ≈ 4.31 h; a = 0.0058 AU; Rp = 0.64–0.89 R⊕; Teq ≈ 1471 K; Smith et al. 2018) - https://arxiv.org/abs/1707.04549 (Smith et al., accepted MNRAS 474, 5523 (2018): "K2-137 b completes an orbit in only 4.3 h, the second shortest orbital period of any known planet") - https://authors.library.caltech.edu/records/vby1w-fvj87 (CaltechAUTHORS repository copy of the published MNRAS paper, same 4.3-h period) BOTTOM LINE: K2-137 b is real and extraordinary — but its year lasts ~4.3 hours (0.18 Earth days), not 8 hours. The 7.9/8-hour figure in the video is incorrect.