Which inner planets are almost certainly doomed to be engulfed by the Red Giant Sun?
Answer
Mercury and Venus are almost certainly doomed to be engulfed
As the Sun expands dramatically into a Red Giant, reaching perhaps 200 times its current diameter, its superheated outer atmosphere will encroach upon the orbits of the innermost planets. Astrophysical projections indicate that Mercury and Venus, being closest to the star, face almost certain engulfment by these expanding, tenuous outer layers. While Earth might only be scorched beyond recognition or spiral inward due to mass loss effects, Mercury and Venus are predicted to be physically consumed by the stellar envelope.
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