Will the Sun swallow Earth in 5 billion years?

Direct Answer

In approximately 5 billion years, the Sun will enter its red giant phase and expand dramatically, but whether it will actually swallow Earth remains an open scientific question. While the Sun will definitely consume Mercury and likely Venus, Earth's fate depends on uncertain factors including how much mass the Sun loses as it ages and resulting changes to Earth's orbital distance. Current models suggest the Sun could expand to between 0.85 and 1.5 astronomical units, meaning Earth might escape engulfment and be pushed further out into the solar system, though it would become uninhabitable regardless.

Why People Get This Wrong

People believe the Sun will definitely swallow Earth in exactly 5 billion years because this is a widely cited timeline from popular science sources for when the Sun enters its red giant phase and begins expanding dramatically, making engulfment seem inevitable.[1][4] This oversimplifies the complex stellar evolution, ignoring uncertainties in mass loss and orbital dynamics that could push Earth outward or delay destruction until around 7.5 billion years.[2][5] The dramatic imagery of a 'cosmic disaster' draws people in, trapping them in a kernel of truth about the Sun's growth while overlooking the 'coin flip' nature of Earth's fate.[2][3]

Sources & Methodology

• 01
  Quanta Magazine - New Clues for What Will Happen When the Sun Eats the Earth

  https://www.quantamagazine.org/new-clues-for-what-will-happen-when-the-sun-eats-the-earth-20231220/

• 02
  University of California, Riverside - Center for Astrophysics and Space Sciences

  https://cnas.ucr.edu/media/2023/12/20/new-clues-what-will-happen-when-sun-eats-earth

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