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Comment by avz

It seems to me that "the universe" is not an appropriate term for our close planetary neighborhood.

There is a difference between an interstellar object passing within 85 times the distance to the Moon (so closer than Mars at closest approach to Earth) and say a supernova thousands or millions of light years away (and hence thousands or millions of years ago).

I don't know where the universe begins, but I'd say Low Earth Orbit and the Moon don't qualify while Proxima Centauri does. For reference:

Distance from ground to space: ~100 km

Distance from California to Australia: ~12,000 km

Distance to the Moon: ~400,000 km

Distance to 'Oumuamua's closest approach: ~33,000,000 km

Distance to Mars at closest approach: ~55,000,000 km

Distance to the Sun: ~150,000,000 km

Distance to Neptune: ~4,500,000,000 km

Current distance to 'Oumuamua ~5,000,000,000 km

Distance to Sedna: ~13,000,000,000 km

Distance to Proxima Centauri: ~40,000,000,000,000 km

parent avz 3 years ago

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