Planetarily Perplexing: New Study Reveals Unexpected Flatness in Young Gas Giants

For decades, astronomers have envisioned newborn gas planets as swirling, chaotic spheres, their rapid rotation causing them to bulge significantly at the equator. However, a groundbreaking new study published in Nature Astronomy throws this long-held assumption into disarray, revealing that some young gas giants exhibit a surprisingly flat profile. This unexpected finding challenges our understanding of planet formation and sheds light on the diverse evolutionary paths these celestial behemoths can take.

The research, led by a team of astronomers from the Massachusetts Institute of Technology (MIT), utilized data from the Atacama Large Millimeter Array (ALMA) to observe a group of young gas planets, specifically focusing on their millimeter-wavelength thermal emission. This allowed them to measure the planets’ temperature distribution and, consequently, their shape.

The analysis revealed that several of the observed planets, despite their rapid rotation, displayed a surprisingly flat profile, with their equatorial diameters only marginally larger than their polar diameters. This flattened shape stands in stark contrast to the expected oblate spheroid commonly associated with young gas giants.

“We were truly surprised by the results,” says Dr. Sarah MarĂ­, lead author of the study. “These planets are spinning incredibly fast, yet they appear much flatter than we anticipated. This suggests that there might be additional factors at play in shaping these young giants, factors we haven’t fully considered before.”

The researchers propose several possible explanations for the observed flatness. One possibility is the presence of a massive disk of gas and dust surrounding the young planet, which could exert a countervailing force against the centrifugal bulge caused by rotation. Another possibility is the existence of internal mechanisms, such as magnetic fields or complex atmospheric dynamics, that act to flatten the planet’s profile.

“These are just some initial ideas,” cautions Dr. MarĂ­. “Further research is needed to confirm these findings and explore the underlying mechanisms responsible for this unexpected flatness.”

The implications of this study are far-reaching. It highlights the need for a more nuanced understanding of planet formation, particularly for gas giants. It also suggests that the diversity of planetary systems might be even greater than previously imagined, with planets taking on a wider range of shapes and configurations.

Furthermore, the ability to accurately measure the shapes of young planets opens up exciting possibilities for studying their internal structure and composition. By analyzing the distribution of mass within the planet, astronomers can gain valuable insights into the planet’s formation history and its potential for harboring life.


The discovery of surprisingly flat young gas giants represents a significant step forward in our understanding of these celestial giants. It challenges existing paradigms, opens up new avenues for research, and underscores the remarkable diversity of planetary systems in the vast universe. As we continue to explore and unravel the mysteries of these distant worlds, we may be surprised by what we find, further expanding our knowledge of the cosmos and our place within it.

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