James Webb Discovers a Lava Planet With a Giant Sunscreen

 A scorching world 280 light-years from Earth has stunned astronomers by apparently surviving beneath a protective blanket of mineral clouds — despite temperatures hot enough to melt rock.

Astronomers using NASA's James Webb Space Telescope have uncovered surprising evidence that one of the most extreme planets ever studied may possess a natural defense against the intense radiation of its star. The distant world, known as TOI-561 b, is believed to be covered by a vast ocean of molten rock. Yet instead of being a completely exposed, atmosphere-free planet, it appears to be surrounded by a highly reflective atmosphere.

The discovery, announced on October 27, 2026, challenges existing ideas about how rocky planets behave when they orbit dangerously close to their stars. Researchers found that TOI-561 b may reflect approximately 75% of the starlight reaching it, potentially thanks to clouds made of vaporized minerals. These unusual clouds could act like a gigantic planetary sunscreen, helping explain how the planet has retained an atmosphere under conditions that should have stripped it away billions of years ago.

A Planet Where Rock Can Melt

TOI-561 b is located approximately 280 light-years from Earth and belongs to a class of planets known as ultra-short-period exoplanets. Unlike Earth, which takes 365 days to orbit the Sun, this extraordinary world completes an entire orbit around its star in less than 11 hours.

That means a year on TOI-561 b is shorter than a typical working day on Earth.

The planet orbits incredibly close to its host star, receiving an enormous amount of radiation. Scientists estimate that temperatures on its permanently illuminated side can reach around 1,800 degrees Celsius (3,200 degrees Fahrenheit), hot enough to melt many common rocks.

At such extreme temperatures, the surface may contain an enormous ocean of magma. Instead of ordinary oceans, forests or mountains resembling those on Earth, TOI-561 b could be dominated by glowing molten material beneath a dense and chemically unusual atmosphere.

The planet is also believed to be tidally locked, meaning the same hemisphere continuously faces its star. One side experiences permanent daylight, while the opposite hemisphere remains in darkness.

These conditions make TOI-561 b an extraordinary natural laboratory for studying planets that exist at the limits of what astronomers once considered possible.

The Atmosphere That Should Not Exist

For years, scientists believed that small rocky planets orbiting extremely close to their stars would struggle to maintain substantial atmospheres. Intense stellar radiation can heat atmospheric gases and allow them to escape into space over long periods.

TOI-561 b appeared to be a perfect example of a planet that should have lost most of its atmosphere long ago. But observations from the James Webb Space Telescope revealed something unexpected.

An international research team, including scientists from the University of Birmingham and the University of Waterloo, monitored the planet continuously for approximately 37 hours. During that time, Webb observed nearly four complete orbits around its star.

The researchers examined changes in the planet's brightness and heat as different portions of its surface came into view. This technique, known as phase-curve observation, allowed scientists to investigate how energy moves around the planet.

Their results strongly suggested that TOI-561 b is not simply a bare, glowing ball of rock.

Instead, the observations were best explained by the presence of a substantial atmosphere capable of reflecting incoming radiation and transporting heat between the planet's hemispheres.

The discovery raises a major question: how has such an atmosphere survived for billions of years?

A Giant Sunscreen Made of Mineral Clouds

Perhaps the most fascinating finding concerns the 7-strange-planets extraordinary reflectivity.

Scientists had previously noticed that TOI-561 b's dayside appeared cooler than expected. If the planet were a dark, atmosphere-free world absorbing most of the radiation from its star, its surface should have been considerably hotter.

One possible explanation was that heat was being transported from the dayside to the nightside.

However, when researchers examined the nightside, they discovered that it was not warm enough to account for all the missing energy.

This suggested that much of the incoming starlight was never being absorbed in the first place.

The team's analysis indicates that TOI-561 b may reflect roughly three-quarters of the radiation it receives from its star. That is an extraordinary amount, comparable to the reflectivity of Venus, whose thick cloud cover makes it one of the brightest planets in our solar system.

Computer models suggest that clouds containing silicate minerals could explain this phenomenon.

These clouds may include silicon dioxide and magnesium silicate, substances related to minerals commonly found in rocks on Earth. Under the extreme conditions of TOI-561 b, mineral material may exist in the atmosphere and form reflective clouds.

Instead of water droplets like those found in Earth's clouds, this alien atmosphere could contain particles formed from rock-related compounds.

The clouds would reflect a large portion of incoming starlight back into space, acting like a natural sunscreen above the planet's molten surface.

Importantly, scientists have not directly confirmed the exact composition of these clouds. Their existence and properties are inferred from telescope measurements and atmospheric models.

Could a Global Lava Ocean Keep the Atmosphere Alive?

The planet's unusual atmosphere presents another mystery.

Even with reflective clouds, TOI-561 b is exposed to intense stellar radiation. Over billions of years, such conditions should make it difficult for atmospheric gases to survive.

One possible explanation lies beneath the clouds.

Researchers suspect that the planet's global magma ocean may continuously release gases into the atmosphere. In effect, the entire planet could behave like an enormous volcanic system.

On Earth, volcanic eruptions release gases such as carbon dioxide, sulfur dioxide and water vapor. Similar processes may occur on TOI-561 b, but on a much larger scale.

If molten rock constantly releases atmospheric gases, it could replace material that escapes into space.

This would create an ongoing exchange between the planet's interior and its atmosphere, allowing the atmosphere to survive much longer than expected.

Scientists are still investigating whether the planet's atmosphere resembles an extreme version of Venus, dominated by carbon dioxide, or something closer to Jupiter's volcanic moon Io, where sulfur compounds play an important role.

The answer could reveal how rocky planets maintain atmospheres under extraordinarily hostile conditions.

How James Webb Made the Discovery

The James Webb Space Telescope is designed to study some of the most distant and challenging objects in the universe. Its powerful infrared instruments allow astronomers to investigate planetary atmospheres that cannot be observed directly in ordinary visible light.

TOI-561 b is far too distant and too close to its host star for Webb to photograph its surface in detail.

Instead, scientists study subtle changes in the combined light from the planet and its star.

As TOI-561 b travels around its orbit, the amount of infrared radiation reaching the telescope changes. By measuring these variations, researchers can estimate the planet's temperature distribution and investigate the properties of its atmosphere.

The 37-hour observation campaign provided an unusually detailed view of the planet's orbital cycle.

The resulting measurements allowed scientists to compare the observed temperatures with sophisticated computer simulations. Models featuring a reflective atmosphere and moderate heat transport provided a much better explanation than models treating the planet as bare rock.

These observations demonstrate how astronomers can learn about worlds hundreds of light-years away without ever seeing their surfaces directly.

What This Discovery Means for Other Planets

The implications extend far beyond TOI-561 b.

Astronomers have discovered thousands of exoplanets, including many rocky worlds orbiting extremely close to their stars. Some were previously assumed to be stripped of their atmospheres because of intense radiation.

But TOI-561 b suggests that the relationship between stellar radiation and atmospheric survival may be more complicated than expected.

A planet's interior could play an important role in maintaining its atmosphere. Magma oceans, volcanic activity, atmospheric circulation and reflective clouds may all influence how much heat a planet absorbs and how quickly its gases escape.

Understanding these processes is important for interpreting observations of other rocky exoplanets.

A planet that appears too hot or too close to its star to retain an atmosphere might still possess one under the right conditions.

The discovery could therefore change how scientists classify and study some of the most extreme worlds in our galaxy.

It also highlights the importance of examining planets over their complete orbits rather than relying on measurements from only one hemisphere.

Could Life Exist on TOI-561 b?

Despite its remarkable atmosphere, TOI-561 b is not considered a promising environment for life as we know it.

Temperatures are far beyond the limits tolerated by known organisms, and the planet may be covered in molten rock. Its atmosphere, whatever its precise composition, would also be radically different from the breathable air surrounding Earth.

The discovery is therefore not evidence of extraterrestrial life.

Instead, its importance lies in revealing how planetary atmospheres can behave under extreme conditions.

Understanding the survival of atmospheres on hostile planets may eventually help astronomers distinguish potentially habitable worlds from those that are fundamentally unsuitable for life.

Even planets that could never support living organisms can teach us important lessons about the diversity of worlds beyond our solar system.

The Next Mystery James Webb Must Solve

The research team now hopes to investigate the atmosphere of TOI-561 b in greater detail.

Future observations at longer infrared wavelengths could help determine which gases dominate its atmosphere and whether mineral clouds are truly responsible for its remarkable reflectivity.

Scientists also want to understand how the planet's atmosphere interacts with its molten interior and whether volcanic processes continuously replenish escaping gases.

These questions could reveal why TOI-561 b has apparently maintained a substantial atmosphere for billions of years despite its extreme environment.

For now, the planet remains one of the most intriguing examples of how nature can defy scientific expectations.

A world that should have been stripped bare by its star may instead be wrapped in clouds made from minerals, reflecting much of the radiation that strikes it.

And somewhere 280 light-years away, beneath a sky unlike anything on Earth, an ocean of molten rock may be helping an extraordinary atmosphere survive against the odds.

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