Edit: guys I didn’t made this template, can you please calm down?
8 points
What defines being on earth? Below the atmosphere? stratosphere? Being in contact with the ground? Being more than 10m up?
2 points
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I would say, anything whose spacetime geodesic (orbital/freefall path) intersects the spheroid defined by the surface of the Earth. Though by this definition, a comet on a 100-year collision course is already “on Earth”, so I’m not sure if that’s reasonable.
1 point
