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some possible causes of Global Catastrophe - see link
no one should panic - it's not likely to happen in our lifetime - although possible - but one of these events will prolly happen sometime in the distant future of the universe
A gigantic asteroid could collide with the Earth and destroy our planet or much of it
Planetary or Interstellar Collision - scientists say there is a 1% chance that the planet Mercury's orbit could be made unstable by Jupiter's gravitational pull and that it possibly could collide with Earth
The Sun - a powerful solar flare, solar superstorm or solar micronova could cause a drastic increase or decrease in the Sun's power and could have severe consequences for life on Earth
Uninhabitable Universe - the expansion of spacetime could cause the destruction of all matter in a Big Rip scenario - I don't really understand this one at all
Extraterrestial Invasion - intelligent alien life if it exists could invade Earth and destroy it or enslave humans or exploit the planet's resources
Natural Pandemic - viruses and diseases caused by antibiotic resistant bacteria - similar to and worse than smallpox, bubonic plague and Covid
Natural Climate Change - such as an ice age
Super Volcano - the eruption of a super volcano could lead to a volcanic winter similar to a nuclear winter - human extinction is possible
Nuclear War or Chemical warfare
https://en.wikipedia.org/wiki/Global...ophe_scenarios
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