NASA’s James Webb Space Telescope Reveals Harsh Reality of Exoplanet LHS 3844 b, a Barren World 30% Larger Than Earth
Washington: Astronomers have achieved unprecedented insights into the surface of an exoplanet, LHS 3844 b, also known as Kua’kua, thanks to the capabilities of NASA’s James Webb Space Telescope. This rocky exoplanet, approximately 30% larger than Earth, has been identified as a desolate and airless world, with surface conditions that may closely resemble those of Mercury, the innermost planet in our solar system.
Characteristics of Kua’kua
LHS 3844 b orbits a star that is smaller and less luminous than the Sun, situated about 49 light-years from Earth. A light-year, the distance light travels in one year, is equivalent to approximately 5.9 trillion miles (9.5 trillion kilometers). The planet’s extreme temperatures—intensely hot on one side and frigid on the other—along with its lack of a discernible atmosphere, suggest it is uninhabitable.
Laura Kreidberg, managing director of the Max Planck Institute for Astronomy in Germany and senior author of a recent study published in Nature Astronomy, remarked on the inhospitable nature of the planet. She described it as “a hellish, barren rock—much more similar to Mercury than it is to Earth.” Kreidberg emphasized the absence of any trace of an atmosphere, noting that the surface appears dark and ancient, akin to a bare rock drifting through space for billions of years.
Observational Insights
The observations indicate that the surface of Kua’kua is likely covered by dark regolith, a loose, fragmented rocky material formed from eons of exposure to stellar radiation and micrometeorite impacts. The James Webb Space Telescope, launched in 2021 and operational since 2022, has revolutionized the study of exoplanets. Its advanced infrared observational capabilities have enabled scientists to discern the chemical composition and internal dynamics of exoplanet atmospheres, including the identification of cloud types.
Sebastian Zieba, the lead author of the study from the Center for Astrophysics at Harvard & Smithsonian, noted that the telescope has allowed astronomers to directly analyze the geology and surface composition of exoplanets. He stated that such investigations were challenging prior to the advent of the James Webb Space Telescope. This advancement also provides a broader context for understanding Earth and the solar system, allowing researchers to determine whether geological processes and surface compositions familiar to our solar system are prevalent around other stars.
The Star and Orbital Dynamics
Kua’kua orbits a common type of star known as a red dwarf, which has a mass about 15% that of the Sun and a luminosity of approximately 0.3%. The planet is in close proximity to its star, completing an orbit every 11 hours. It is also tidally locked, meaning one side consistently faces the star while the other remains in perpetual darkness, similar to the relationship between the Moon and Earth. The surface temperature on the dayside of Kua’kua reaches around 1,340 degrees Fahrenheit (725 degrees Celsius), while no detectable heat was observed on the nightside.
Geological Composition
The James Webb Space Telescope enabled researchers to detect light, specifically in the infrared spectrum, emanating directly from the planet’s surface. Different types of rocks exhibit distinct spectral fingerprints, akin to atmospheric signatures. Zieba explained that dark volcanic rocks, such as basalt, aligned more closely with their observations than lighter, silica-rich rocks like granite. The surfaces of both Mercury and the Moon are predominantly basaltic.
Zieba further elaborated on the geological context, stating that widespread granite formation on Earth is associated with the presence of water and plate tectonics. He noted that identifying granite-like surfaces on an exoplanet would not necessarily indicate the presence of life but could suggest a more Earth-like geological history compared to other surfaces.
Another potential match for the observations was a solid surface of relatively recent volcanic rock. However, the researchers did not detect any gases related to volcanism, such as sulfur dioxide.
Implications for Habitability
The absence of an atmosphere on Kua’kua presents significant challenges for the potential for life. Without atmospheric protection, the planet is vulnerable to stellar radiation and charged particles from its star, and the conditions do not allow for the presence of liquid water, which is considered essential for life. Zieba concluded that it is “almost certainly not a habitable world.”
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Published on 2026-05-09 14:13:00 • By the Editorial Desk
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