Future Earth: The Day the Sun Destroys Earth | Full Documentary

In about seven and a half billion years the Sun becomes a red giant and reaches its greatest size. Whether the Earth survives that day has been calculated five separate times since 1993 — and the answer has changed four times. This is the story of what the Sun actually does to the Earth: the surface that melts before the star ever arrives, the tide that decides whether the planet falls in, the outer moons that get switched on by the same event, and a single grain of zircon in a drawer in Western Australia that is older than every ocean and every continent, and whose fate splits on exactly the same argument as the planet's. THE TWO PAPERS THAT DISAGREE These are the only two teams the film names out loud. Same physics, same star, opposite verdicts on whether this planet survives: Earth is ENGULFED — Schröder, K.-P. & Connon Smith, R. 2008, MNRAS 386:155, "Distant future of the Sun and Earth revisited". Tip of the red giant branch at 7.59 billion years, radius 256 R☉ = 1.2 AU — past this orbit. https://academic.oup.com/mnras/articl... Earth LIKELY SURVIVES — Esseldeurs, M., Mathis, S. & Decin, L. 2026, arXiv:2606.19575. First-principles tidal dissipation in place of the older approximation; the answer flips back. https://arxiv.org/abs/2606.19575 It turns on how efficiently a dying Sun sheds mass — a number that has never been measured for our star and is read off other stars. That is the gap the whole film lives inside. ────────────────────────────────────────────── SOURCES — every number in the film MEASURED — directly observed or physically recovered Connelly et al. 2012, Science 338:651 — age of the solar system, 4,567.30 ± 0.16 Myr Valley et al. 2014, Nature Geoscience 7:219 — the Jack Hills zircon at 4,374 Ma, confirmed by atom-probe tomography Bahcall, Pinsonneault & Basu 2001, ApJ 555:990 — helioseismic sound speed agrees with the solar model to 0.10% Kaiser, Lobert & Telle 2008, J. Eur. Ceram. Soc. 28:2199 — zircon dissociates at 1,673 ± 10 °C USGS Hawaiian Volcano Observatory — Kīlauea eruption temperature up to 1,170 °C (2,140 °F), by thermocouple NASA/JPL lunar laser ranging — the Moon recedes 3.8 cm (1.5 in) per year, measured off the Apollo retroreflectors Cassini–Huygens (ESA/NASA) — Titan's surface at ~94 K, 1.5 bar, 94% nitrogen, standing methane seas Kivelson et al. 2000, Science 289:1340 — Europa's induced magnetic field, evidence for a subsurface ocean Koester, Gänsicke & Farihi 2014, A&A 566:A34 — 48 of 85 white dwarfs metal-polluted, 23 actively accreting Vanderburg et al. 2015, Nature 526:546 — the disintegrating planetesimal at WD 1145+017 De et al. 2023, Nature 617:55 — ZTF SLRN-2020, the first observed planetary engulfment Bond et al. 2017, ApJ 840:70 — Sirius B's mass and radius Kervella et al. 2016, A&A 596:A92 — L₂ Puppis, its edge-on disc and a candidate planet NASA Voyager mission telemetry — position, velocity, and the Golden Record MODELLED — the output of a named stellar-evolution or orbital model Sackmann, Boothroyd & Kraemer 1993, ApJ 418:457 — the Sun's evolution; Earth survives Rybicki & Denis 2001, Icarus 151:130 — with tides added, Earth most likely evaporates Lopez, Schneider & Danchi 2005, ApJ 627:974 — the habitable zone migrates to 2–9 AU, then 7–22 AU Schröder & Connon Smith 2008 (above) — tip-RGB at 256 R☉; engulfed; no solar planetary nebula Guo et al. 2016, Ap&SS 361:122 — the outcome turns on one mass-loss efficiency parameter Yarza et al. 2023, ApJ (arXiv:2203.11227) — engulfment hydrodynamics: ram pressure, and a recovery in decades Esseldeurs, Mathis & Decin 2026 (above) — first-principles tidal dissipation, likely survives IMAGINED Every witnessed scene — the sky over the coastline, the shore of Kraken Mare, the view from Mercury's night side, the inside of the envelope — is a reconstruction built on the numbers above. Nobody has photographed the end of the world. One figure in this film is our own arithmetic and is labelled as such: the surface temperatures of 3,164 °F and 2,217 °F are not quoted from a paper. They are the standard equilibrium-temperature relation applied to the two published models' luminosities at the orbits those same models give the Earth. The inputs are cited above; the arithmetic is ours, and it is shown in the film so you can follow it. 🎬 Synthetic content disclosure: this video contains AI-generated imagery. All narration is synthesised. Every number is sourced above. #FutureEarth #Documentary #DeepTime #Astronomy #Geology