Imagine witnessing the death of a star in its earliest moments, a sight so fleeting that missing it by just one day would mean losing it forever. This is exactly what astronomers achieved when they mapped the shape of a supernova for the first time—and the results are nothing short of astonishing. But here's where it gets controversial: the explosion wasn't the perfect sphere we've long assumed. Instead, it resembled something more like an olive, stretched along one axis. Could this challenge everything we thought we knew about how stars die?
Quick Facts
- What it is: An artist’s impression of the supernova explosion SN 2024ggi.
- Where it is: 22 million light-years away in the constellation Hydra.
- When it was shared: November 12, 2025.
On April 10, 2024, the Asteroid Terrestrial-impact Last Alert System (ATLAS) detected the first light from a massive star’s explosion—a star roughly 12 to 15 times the mass of our sun. Just 26 hours later, astronomers swiftly pointed the Very Large Telescope (VLT) in Chile toward the event. This rapid response was crucial, as it allowed them to capture the supernova’s initial phase, a window so brief that it would have been lost if they’d waited even a single day longer.
The resulting image, an artist’s interpretation based on VLT data, is nothing short of breathtaking. It reveals the supernova’s shape during its earliest moments, a phase that has eluded scientists until now. Known as SN 2024ggi, this explosion occurred in the galaxy NGC 3621, located in the constellation Hydra. An image captured by the VLT on April 11, 2024, pinpoints the explosion’s location within the galaxy (https://www.eso.org/public/images/eso2520b/).
But how does a star die, and why does its shape matter? A massive star maintains its near-perfect spherical form due to a delicate balance between its own gravity pulling inward and the outward force of nuclear fusion-powered radiation at its core. When this balance is disrupted, gravity takes over, causing the star’s core to collapse under its own weight. This collapse triggers a rebound of the outer layers, creating a shock wave so powerful it tears the star apart. As the shock breaks through the star’s surface, it releases an immense burst of energy, dramatically brightening the supernova. However, the exact way this shock forms and travels has been a subject of intense debate among scientists.
There’s a fleeting moment, after the explosion but before it interacts with its surroundings, when astronomers can glimpse the supernova’s initial “breakout” shape. Using spectropolarimetry—a technique that analyzes light waves to determine their direction and vibration—scientists with the VLT captured this shape for the first time. Data from the VLT’s FORS2 instrument, the only facility in the Southern Hemisphere capable of such measurements, revealed that the first light from the explosion wasn’t emitted uniformly in all directions. Instead, the initial shock was elongated along one axis, resembling an olive. This suggests the explosion wasn’t perfectly spherical, a finding that challenges traditional models.
As the blast expanded, its light began to interact with the surrounding gas. By day 10, the hydrogen-rich outer layers of the star became visible, and these layers were aligned with the same axis as the initial shock. This indicates that the core explosion had a stable, directional shape from the very beginning, hinting at an underlying mechanism driving this consistency. The study, published on November 12 in Science Advances (https://www.science.org/doi/10.1126/sciadv.adx2925), has already ruled out some existing supernova models while supporting others, offering new insights into the catastrophic deaths of massive stars.
And this is the part most people miss: The non-spherical shape of SN 2024ggi raises questions about the role of magnetic fields, rotation, or even binary star interactions in shaping supernova explosions. Could this be evidence of a previously unknown mechanism at play? Or does it simply highlight the complexity of stellar death? We’d love to hear your thoughts in the comments.
For more awe-inspiring space discoveries, explore our Space Photo of the Week archives (https://www.livescience.com/tag/space-photo-of-the-week). And if you’re curious about the science behind this story, check out the ESO News video (https://youtu.be/mHHpONuSZA8) for a deeper dive.
Shreejaya Karantha, a science writer specializing in astronomy, contributed to this article. Based in India, she works as a writer and research specialist at The Secrets of the Universe, where she creates scripts for research-based and explainer videos. Shreejaya holds a bachelor’s degree in science and a master’s degree in physics with a specialization in astrophysics.
