KU Leuven Study Says Earth Survives Sun’s Death in 5 Billion Years

Q: Earth may survive the Sun's death only to become a barren rock. Does this new forecast offer any real hope?

Only in a very limited sense. The new study offers hope that Earth itself may avoid being swallowed by the Sun, but not that it will remain habitable. The KU Leuven-led research changes the balance between two forces in the Sun’s old age: tidal drag pulling Earth inward and solar mass loss pushing it outward. By rebuilding the tidal physics and comparing it with observations of the Sun-like dying star L2 Puppis, the team found the inward pull is likely weaker than older models assumed. That makes it more likely Earth will drift outward enough to survive both giant-star expansion phases and end up orbiting the Sun’s white-dwarf remnant. But survival of the planet is not survival of life. Long before the Sun becomes a red giant, rising solar brightness is expected to make Earth hostile. Around 1.1 billion years from now, a roughly 10% brighter Sun could trigger severe heating and ocean loss. Plant life would decline as carbon dioxide falls, complex life would disappear, and even microbes are expected to vanish between about 1.6 and 2.8 billion years from now. So the real hope is scientific, not biological. The finding improves astronomers’ understanding of how planets interact with aging stars and strengthens the case that rocky worlds can outlive stellar death. It also helps guide the search for exoplanets around white dwarfs. For Earth itself, though, the forecast points to a surviving world that is almost certainly a dead one.

Q: Scientists just rewrote Earth's ultimate fate. What crucial cosmic force did older models get wrong that now suggests our world will survive?

Older models got the Sun’s **tidal dissipation** wrong — the way tidal forces inside an expanded, aging star drain energy and pull planets inward. The new KU Leuven-led study found that those tidal effects were likely **weaker than earlier simplified models assumed**. In the older picture, strong tides from the swollen red giant Sun would have dragged Earth inward until it was engulfed. In the revised model, that inward pull is reduced. That matters because Earth’s fate depends on a contest between two forces: **tidal drag pulling Earth inward** and the Sun’s **mass loss pushing Earth outward** by weakening its gravity. With weaker tidal dissipation, the outward orbital expansion now appears strong enough for Earth to survive both the Sun’s red giant and later asymptotic giant branch phases. The researchers supported the new calculations with observations of **L2 Puppis**, an aging Sun-like star, and with evidence that some rocky planets orbit **white dwarfs**, showing planets can outlast their stars’ giant phases. This does not mean Earth stays livable. Long before the Sun reaches those final stages, rising solar brightness is expected to boil away the oceans and end surface habitability. But the key revision is clear: **scientists now think the Sun’s tidal pull on Earth was overestimated in older models**.

2 articles · Updated · Earth.com · Jun 24

A new Astronomy & Astrophysics study led by Mats Esseldeurs finds Earth likely escapes engulfment when the Sun dies about 5 billion years from now, reversing long-standing models that predicted destruction during the Sun’s second red-giant expansion.
The shift comes from recalculating how tidal energy dissipates inside an aging, bloated Sun: the updated physics weakens the inward drag enough for solar mass loss to push Earth’s orbit outward instead of pulling it in.
The model still shows Mercury and Venus being swallowed, while Earth and Mars survive the Sun’s first swelling; Earth’s fate remains most sensitive to the later, larger expansion and to how quickly the Sun sheds mass.
Mass-loss estimates still vary by more than a factor of 10, but when the team anchored its model to observations of the Sun-like dying star L2 Puppis, Earth again emerged as a survivor.
The result could reshape forecasts for exoplanets around aging stars, with upcoming planet-hunting observations expected to test how often Earth-sized worlds outlast their suns.

Sources

Earth.com4d ago

New Study by Mats Esseldeurs at KU Leuven Suggests Earth Will Survive Sun's Death

Yahoo! Voices4d ago

The fate of Earth depends on a delicate balance': Our planet may survive the death of the sun after all, n...

Earth may survive the Sun's death only to become a barren rock. Does this new forecast offer any real hope?

Scientists just rewrote Earth's ultimate fate. What crucial cosmic force did older models get wrong that now suggests our world will survive?

Earth May Survive the Sun’s Red Giant Phase: 2026 Breakthrough Reshapes Our Planet’s Predicted Fate

Overview

A groundbreaking study published in June 2026 has overturned the long-held belief that Earth will be destroyed when the Sun becomes a red giant. For years, scientists thought intense tidal forces would pull Earth into the expanding Sun, sealing its fate. However, new models from KU Leuven and CEA Paris-Saclay reveal that Earth may actually survive this dramatic phase. This shift in understanding comes from improved modeling of tidal forces and solar mass loss, showing that Earth could escape engulfment and continue orbiting the Sun, reshaping our view of the planet’s distant future.

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