🔥 What if Earth moved closer to the Sun?
Years shorten and sunlight intensifies with the inverse-square law.
The science
Move Earth to 0.9 AU and sunlight rises by about 23% (1/0.9²), while the year shrinks to about 312 days (Kepler: T ∝ a^1.5). Use the equilibrium temperature calculator to estimate the no-greenhouse temperature at different distances.
Immediate consequences (modelled)
Hotter climate; shorter years; brighter, slightly larger Sun in the sky.
Possible long-term consequences (hypotheses)
Sustained warming could trigger strong water-vapour feedback depending on the new distance.
Assumptions: Circular orbit at new distance; same atmosphere initially.
Limitations: Does not model climate, geology, biology or engineering in full detail.
Reference: NASA / peer-reviewed planetary science