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Scientists Discover Way to Send Information into Black Holes Without Using Energy

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Astronomers Solve Mystery of a Planet That Spins Backwards Around Its Star

For years, one strange planet has puzzled astronomers. While nearly every known hot Jupiter follows a predictable pattern, the giant exoplanet CoRoT-2 b seemed determined to break the rules. Now, new research has finally uncovered the most likely explanation behind its bizarre behavior—and the discovery could change how scientists understand planets beyond our solar system.

The study was led by Aurora Kesseli, a scientist at the NASA Exoplanet Science Institute (NExScI) at IPAC, a science and data center for astrophysics and planetary science at the California Institute of Technology (Caltech). The findings were presented at the 248th meeting of the American Astronomical Society in Pasadena, California, on June 16, 2026.

What Makes Hot Jupiters So Interesting?

Hot Jupiters are giant gas planets similar in size to Jupiter, but they orbit extremely close to their host stars. Unlike Jupiter, which takes nearly 12 Earth years to orbit the Sun, hot Jupiters can complete an orbit in just a few days.

Because they are large and receive intense starlight, these planets are easier to observe than many other exoplanets. Scientists can collect detailed information about their atmospheres, temperatures, and weather patterns, making them excellent laboratories for studying planetary formation and evolution.

Over the years, astronomers have noticed a common feature among hot Jupiters. Their hottest atmospheric region, known as a “hot spot,” is usually shifted slightly in the direction of the planet’s orbit. This happens because powerful winds transport heat around the planet.

However, CoRoT-2 b is different.

A Planet That Refused to Follow the Rules

In 2018, astronomers discovered that the hottest region on CoRoT-2 b was located in the opposite direction from where it should be. This unusual observation challenged existing models of hot Jupiter atmospheres.

To explain the strange behavior, researchers proposed three possible ideas:

  1. Thick clouds could be hiding part of the atmosphere and misleading observations.

  2. Complex magnetic field interactions could be affecting atmospheric circulation.

  3. The planet might not be tidally locked, meaning its rotation does not match its orbital motion.

For years, scientists could not determine which explanation was correct.

Investigating the Mystery

Kesseli and her team used new spectroscopic observations collected by the European Southern Observatory’s Very Large Telescope (VLT). By analyzing how light interacted with the planet’s atmosphere, they were able to measure the planet’s motion and gather clues about its rotation.

What they found was surprising.

The data strongly suggested that CoRoT-2 b rotates more slowly than expected. In fact, the planet appears to take about three Earth days to complete one rotation on its axis.

That might not sound unusual at first, but there is a catch.

The planet completes an orbit around its star in only about 1.5 Earth days.

This means that by the time CoRoT-2 b finishes a single day, it has already traveled around its star twice.

Challenging a Long-Held Assumption

Most astronomers assumed that hot Jupiters are tidally locked because they orbit so close to their stars.

Tidal locking occurs when a star’s gravity gradually slows a planet’s rotation until the same side always faces the star. A familiar example is Earth’s Moon, which always shows the same face to Earth.

Because hot Jupiters are subjected to intense gravitational forces from nearby stars, scientists believed they should all become tidally locked relatively quickly.

The new findings suggest that CoRoT-2 b may be a rare exception.

According to Kesseli, the observations clearly point toward the third hypothesis proposed years ago: the planet rotates more slowly than it orbits.

This discovery challenges the idea that all hot Jupiters behave in the same way.

Why Tidal Locking Matters

Understanding whether a planet is tidally locked is important for more than just studying giant gas planets.

Many potentially habitable worlds orbit small, cool stars known as M dwarfs. These stars are the most common type in the universe. Because their habitable zones are located close to the star, planets within them are expected to become tidally locked.

A tidally locked planet experiences permanent day on one side and permanent night on the other. This dramatically affects temperatures, weather systems, and atmospheric circulation.

If some planets can avoid tidal locking or rotate differently than expected, scientists may need to rethink how they model climates on distant worlds.

The way a planet rotates determines how efficiently heat is distributed across its surface and atmosphere. That, in turn, influences whether conditions might be suitable for life.

A New View of Exoplanet Atmospheres

The discovery highlights an important lesson for planetary scientists: nature is often more complicated than theories suggest.

For many years, astronomers relied on a relatively simple picture of hot Jupiter behavior. Most observations appeared to fit that framework, reinforcing the assumption that these worlds shared similar atmospheric patterns.

CoRoT-2 b demonstrates that exceptions exist.

Instead of fitting neatly into established models, this unusual planet shows that each world can have its own unique history and physical processes.

According to Kesseli, every hot Jupiter studied in detail teaches researchers something new. Each discovery helps improve models that are ultimately used to understand a wide range of exoplanets.

Questions Still Remain

Although scientists now have strong evidence that CoRoT-2 b is not tidally locked, one major mystery remains unanswered.

Why is the planet rotating so slowly?

Researchers are still investigating the mechanisms that could have prevented tidal locking or altered the planet’s rotation over time. Possible explanations may involve the planet’s age, internal structure, interactions with its star, or other factors that have yet to be identified.

Future observations will be needed to solve this next piece of the puzzle.

The Future of Exoplanet Exploration

The study also highlights the exciting future of planetary science.

Next-generation observatories, including the planned Habitable Worlds Observatory and the Extremely Large Telescope, will allow astronomers to study exoplanet atmospheres with unprecedented detail.

These powerful instruments could reveal how common unusual planets like CoRoT-2 b really are and help scientists investigate worlds that may be capable of supporting life.

As technology advances, researchers will be able to compare a larger variety of planets and test theories that were impossible to examine just a few years ago.

A Planet That Changed the Conversation

CoRoT-2 b may be a scorching gas giant located far beyond our solar system, but its impact on astronomy is significant. By refusing to behave like every other known hot Jupiter, it forced scientists to question long-standing assumptions.

The new research suggests that this strange world rotates more slowly than it orbits its star, making it one of the most unusual exoplanets ever studied.

More importantly, it reminds us that the universe is full of surprises. Every time astronomers look closer, they discover that distant worlds are often far more diverse and complex than anyone imagined.

Reference: Aurora Y. Kesseli et al, Unraveling the Mystery of the Peculiar and Young Hot Jupiter CoRoT-2b II: Phase Resolved Emission Spectroscopy with VLT/CRIRES+ and Gemini-S/IGRINS, The Astronomical Journal (2026). On arXiv. DOI: 10.48550/arxiv.2606.17304

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