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Fruhm: https://ourplnt.com/earth-18-galactic-years-old/

The Earth is actually a fast-moving spacecraft. It orbits around Sun with an average speed of about 30 km/s (67,000 mph or 108,000 kmh), but what’s more, our galaxy, the Milky Way also rotates. It makes one rotation every 250 million years or so. As a result, our planet is approximately 18 galactic years old.