@cass.nyuad: A 4.5-billion-year situationship. Earth has been in gravitational lock with the Sun since the collapse of the solar nebula, trailing its 230-million-year orbit around the Milky Way core. Enjoy the view while it lasts. In about 5 billion years, our host star will exhaust the hydrogen fuel in its core, leave the main sequence, and expand into a red giant. When that happens, the Sun’s outer atmosphere will swell past the orbits of Mercury, Venus, and very likely engulf Earth entirely. #edit #sun #earth #Astronomy #nasa

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Wednesday 23 September 2026 14:39:29 GMT