💨 What if Earth's atmosphere disappeared?
Silence, boiling oceans' surface, lethal radiation — an immediate emergency.
The science
Without atmospheric pressure, exposed water boils at body temperature, sound cannot travel, the sky turns black even at noon, and unfiltered solar ultraviolet reaches the surface. Oceans would not vanish instantly, but the surface would become Mars-like quickly.
Immediate consequences (modelled)
Suffocation without suits; pressure loss boils moisture in eyes and lungs; total silence outdoors.
Possible long-term consequences (hypotheses)
Oceans slowly evaporate/sublimate and escape; Earth becomes a dry, crater-preserving world.
Assumptions: Instant removal thought experiment; oceans initially remain.
Limitations: Does not model climate, geology, biology or engineering in full detail.
Reference: NASA / peer-reviewed planetary science