Venus was once a mirror image of Earth before its climate broke

Nature · Published 21 October 2026 Swipe more like this →

In short: Scientists long viewed Venus as an alien wasteland, but new evidence suggests it may have once looked remarkably like our own home. By studying the planet's complex geological scars, researchers are uncovering a history of intense tectonic activity that challenges our understanding of how planets evolve.

Venus is frequently called Earth’s 'evil twin' because of its similar size and shared planetary material. However, it currently exists as a hellish environment characterized by a poisonous atmosphere of carbon dioxide, sulfuric acid rain, and surface temperatures reaching 470ºC—hot enough to melt lead. Its extreme heat is driven by a runaway greenhouse effect, where the dense atmosphere traps solar energy that would otherwise radiate into space. This process is so intense that Venus is actually hotter than Mercury, despite being further from the Sun.

Recent research published in Nature Geoscience suggests this wasteland was once much more dynamic. Scientists identified 'tesserae'—striking plateaus on the surface of Ishtar Terra—that indicate billions of years ago, Venus may have possessed intense tectonic activity similar to what created Earth's earliest continents. The region comprises a crustal plateau roughly the size of Australia, averaging 4 kilometers high, encircled by mountain ranges peaking at 10 kilometers—surpassing even the Himalayas.

The discovery is significant because active plate tectonics have only been observed on Earth. Today, Venus has a 'stagnant lid' lithosphere with minimal movement, but these complex geological features suggest it may have transitioned from a state of limited tectonic movement to its current stagnant state early in its history. By studying the mechanisms that led to this irreversible climate change, scientists gain a clearer perspective on the delicate balance of our own atmosphere and the potential consequences of runaway greenhouse effects.

The study, led by Fabio Capitanio of Monash University in collaboration with NASA, highlights how planets can diverge so radically from their neighbors. While Earth maintains its habitable temperature through natural greenhouse gases like water vapor and ozone, Venus serves as a stark warning of what happens when those balances are destroyed.

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