Astronomers Observe Aftermath of Planetary Collision Around Gaia20ehk
Researchers have detected evidence of a planetary collision around the star Gaia20ehk, providing insights into planetary system formation.
Astronomers have observed evidence of a planetary collision around the star Gaia20ehk, located approximately 11,000 light-years from Earth in the constellation Puppis. The star, similar to our Sun, exhibited unusual brightness fluctuations beginning in 2016, with significant dimming events and increased infrared emissions. These observations suggest a massive dust cloud, likely resulting from a collision between two planets, is orbiting the star.
Anastasios Tzanidakis, a doctoral candidate at the University of Washington, noted that such behavior is atypical for stable main sequence stars. He stated, "The star's light output was nice and flat, but starting in 2016 it had these three dips in brightness. And then, right around 2021, it went completely bonkers."
The collision's debris cloud orbits Gaia20ehk at approximately one astronomical unit—the same distance between Earth and the Sun. This scenario mirrors the hypothesized giant impact that formed Earth's Moon about 4.5 billion years ago. Professor James Davenport of the University of Washington highlighted the significance of such events in understanding planetary formation and their potential role in creating conditions conducive to life.
The findings were published in The Astrophysical Journal Letters on March 11, 2026.