Why Venus is hotter than Mercury: the runaway greenhouse in one diagram

A 5-beat faceless video outline for “Why Venus is hotter than Mercury: the runaway greenhouse in one diagram” in the Space and astronomy facts niche, derived from caption timing of 2 reference videos.

Angles

• Cold-open on the ranking surprise: Mercury is closer to the Sun, yet Venus is the hottest planet
• Put both temperature ranges on one chart — Mercury swings roughly −173 °C to 427 °C, Venus sits near 475 °C day and night
• Make the atmosphere the whole explanation: thick CO₂ blanket, runaway greenhouse, heat spread evenly — vs Mercury's near-absent atmosphere
• Close on how we know: Soviet Venera landers measured the surface before failing

Beat-by-beat structure

1. Hook (0:00–0:30): two planets, distance to the Sun vs surface temperature — the order flips.
2. Mercury (0:30–1:30): almost no air, heat escapes, extreme day/night swing.
3. Venus (1:30–3:30): dense CO₂ atmosphere, crushing pressure, clouds that reflect light yet trap heat.
4. Evidence (3:30–5:00): Venera 7 and 8 surface readings; what they could and could not survive.
5. Recap card + Earth comparison: same greenhouse physics, very different dose. Original narration only.

Reference videos

• Why Is Venus The Hottest Planet? LpVZrNciKuE
• What They Didn't Teach You in School about Venus | Our Solar System's Planets djP-IdHFQWU

Method

yt-dlp VTT captions (manual/uploader only) → timed beat heuristics → editorial topic synthesis (no ASR). Structure only; write original narration.