Did a massive cosmic collision 4.5 billion years ago make Earth habitable?
In short: Earth's axial tilt is crucial for life, but it may not have happened by chance. This video examines the Big Whack theory, which suggests a Mars-sized object struck our planet, potentially creating the Moon and setting our current obliquity.
Approximately 4.5 billion years ago, Earth experienced a violent encounter when a rock comparable in size to Mars collided with it at a speed of 9 kilometers per second. This event, often referred to as the Big Whack, generated enough force to melt the planet's surface into a vast ocean of magma.
Beyond the immediate destruction, this collision is theorized to have formed the Moon and established Earth's axial tilt. This obliquity remains a pivotal factor in the planet's ongoing processes, influencing the conditions that allow life to exist today.
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Sources
- Summary by Intellect · source: One big reason that life on Earth exists - Elise Cutts
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