A cosmic catastrophe 11,000 light-years away mirrors our own origins

Space · Published 22 October 2026 Swipe more like this →

In short: Astronomers have captured a rare celestial event: two planets smashing into one another. This violent collision sent clouds of hot dust and debris into space, creating a flickering light show that provides a rare, real-time window into how our own moon and Earth were formed.

Situated by the Pupis constellation, Gaia20ehk represents a steady main-sequence star resembling our own sun. Under normal conditions, such stars maintain a steady, predictable brightness. However, observations revealed that starting in 2016, the star began to exhibit three distinct dips in brightness, before behaving erratically around 2021. Because stars like our sun do not naturally flicker in this manner, researchers looked for external causes. Tzanidakis first identified these anomalies while reviewing archived telescope data from 2020. The star is located approximately 11,000 light-years from our own planet.

The team, led by Anastasios Tzanidakis of the University of Washington, determined the flickering was caused by vast clouds of hot dust and rock passing between the star and Earth. This debris is the signature of a violent planetary collision. While planet formation is a chaotic process where gravity pulls dust, gas, and ice together, witnessing a collision from Earth is incredibly rare. It requires the orbiting debris to align perfectly with our line of sight to block the star's light. The debris was scattered throughout the entire system by the impact. This process of smashing together or throwing bodies outward is a standard part of early solar system development.

This specific event is notable because it bears striking similarities to the impact that created the Earth and the Moon. By observing these moments in real-time, scientists can better understand the mechanics of how planetary systems stabilize over tens of millions of years. The findings, published in The Astrophysical Journal Letters on March 11, offer a rare opportunity to study the The dimming patterns caused by these orbiting clouds can evolve gradually over a period of several years. This research provides a unique chance to see how gravity shapes and stabilizes planetary systems.

General information, not professional advice. Spotted an error? Flag the card or see corrections and complaints.

Intellect Plus is a visual educational discovery platform for exploring fascinating facts and ideas. Brain Food, Not Brain Rot. What is Intellect Plus?

Related

• The mysterious dimming of Tabby’s Star was not caused by aliens
• Why astronomers are baffled by the erratic dimming of a distant, mysterious star
• Our Sun probably had thousands of sibling stars it has since lost
• The Gaia mission has finally mapped two billion stars, revealing our galaxy is wobbling.
• A celestial dimmer switch: why a distant star behaves so strangely
• On Mercury, a single sunrise-to-sunrise day lasts two of its years
• A rare celestial encounter as a comet grazes the Red Planet
• A tiny dark dot reveals secrets of our solar system
• Mars may owe its lopsided face to a Pluto-sized collision
• To an astronomer, oxygen and carbon count as metals
• Why your days aren't perfectly equal on the equinox
• The 1833 Leonid storm proved shooting stars come from space

More in Astronomy · More in Space · Latest · A–Z · All topics