Giant Asteroids Collide Cataclysmically in a Star System Close to Us: Astronomers Report


A recent observation by the Webb Space Telescope revealed that a massive dust cloud, which was spotted around a young star called Beta Pictoris two decades ago, has mysteriously disappeared. The Beta Pictoris star system is located just 63 light-years away from Earth. A new study suggests that the dust cloud might have resulted from a violent collision that pulverized large celestial bodies, scattering their remains across the Beta Pictoris system.

The scientists used data from the Webb telescope and compared it with older observations from the Spitzer Space Telescope, captured in 2004 and 2005. They theorize that a cataclysmic collision between large asteroids occurred approximately 20 years ago. This event shattered the celestial bodies into fine dust particles smaller than powdered sugar. As the dust moved away from the star, it likely cooled down, which explains why it no longer emits the same thermal features first detected by Spitzer.

Christine Chen, an astronomer at the Space Telescope Science Institute and Johns Hopkins University, was the first to observe Beta Pictoris in 2004 using the Spitzer Space Telescope. She led the new study and was surprised to find the previously detected dust particles had completely vanished in the recent data from the Webb telescope.

Beta Pictoris, believed to be between 20 to 26 million years old, is relatively young compared to our solar system, which is approximately 4.6 billion years old. Young star systems are generally more unpredictable as terrestrial planets are still forming through giant asteroid collisions.

The researchers found that the dust cloud was 100,000 times larger than the asteroid that led to the extinction of the dinosaurs. This suggests that the collision which possibly caused this massive cloud likely involved an asteroid the size of Vesta, the second most massive body in the main asteroid belt, which stretches across 329 miles (530 kilometers) in diameter.

The dust was dispersed by radiation from the star and heated up, emitting thermal radiation detected by Spitzer’s instruments. Webb’s recent observations revealed the dust had disappeared and had not been replaced, indicating a violent collision.

These recent observations of Beta Pictoris can help scientists understand whether the formation process that shaped our solar system is rare or common throughout the universe, and how these early collisions impact the habitability of a given star system.



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