Key Points
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JWST detected signs of gas around ultra-hot exoplanet TOI-561 b
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Hidden young star clusters discovered inside dusty galaxy NGC 628
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A distant “super-puff” planet’s thick haze blocks all chemical signals
BALTIMORE: The James Webb Space Telescope is uncovering new details about planets and galaxies that were once considered too extreme or too obscured to study, according to a series of recent research findings.
In one of the most striking observations, astronomers reported evidence suggesting that TOI-561 b, an ultra-hot rocky exoplanet, may retain an atmosphere despite conditions previously thought to make that impossible.
The planet, located outside the Solar System, orbits extremely close to its star and completes a full orbit in just 10.56 hours. Scientists expected its surface temperatures to reach nearly 4,900 degrees Fahrenheit. Instead, measurements showed temperatures closer to 3,200 degrees, indicating that heat may be circulating around the planet, a key sign of an atmosphere.
Researchers used the telescope’s near-infrared instruments to measure the planet’s thermal signature as it passed behind its star, allowing them to estimate how heat is distributed across its surface.
“This challenges what we thought we knew about rocky planets in extreme environments,” an astronomer involved in the study said.
In a separate study, the telescope was used to peer through dense cosmic dust in a nearby spiral galaxy known as NGC 628, revealing 14 previously hidden young star clusters.
These clusters are in an early stage of formation and remain embedded in their birth clouds, making them difficult to detect with traditional optical telescopes. Using infrared observations, scientists identified key signatures including hydrogen and helium emissions, which indicate active star formation.
The findings suggest that what was once considered an “invisible phase” of star cluster development can now be directly observed.
At the same time, another set of observations highlights the limits of even the most advanced space telescope.
Scientists studying a distant exoplanet known as Kepler-51d found that its atmosphere is covered by an extremely thick haze layer that blocks all chemical signals beneath it. The planet, often described as a “super-puff” due to its unusually low density, appears to be wrapped in particles that scatter light in a smooth pattern, preventing researchers from identifying its composition.
“We expected to find chemical fingerprints, but instead we found a wall,” a researcher involved in the study said.
The haze layer is believed to exist at very high altitudes, with particles similar in size to those found in Titan’s atmosphere but on a much larger scale.
Together, these findings highlight both the expanding capabilities and the current limitations of the James Webb Space Telescope.
While it is revealing atmospheres on planets once thought unable to hold gas and uncovering hidden star formation deep inside galaxies, it is also encountering new mysteries, including planets whose atmospheres are too thick to see through.
For scientists, the results mark a shift in astronomy, where extreme and previously theoretical environments are becoming measurable, but not always fully understood.
