According to the provided timeline comparison, which event poses a more near-term existential threat to Earth's surface habitability?
Answer
The Sun becoming hot enough to cause a runaway greenhouse effect
The Sun's internal evolution is the most certain, near-term threat, expected to cause a runaway greenhouse effect and boil off oceans in about 1 billion years, long before the galactic merger begins.
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How Would We Survive If the Milky Way Collided with Andromeda?
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