Astronomers Spot Earth-Sized Planet Orbiting Ultra-Cool Star!

By Lydia Amazouz Published on May 15, 2024 10:35
Astronomers Spot Earth-Sized Planet Orbiting Ultra-Cool Star!

In a remarkable advancement in the field of astronomy, an international team of astronomers has made a significant discovery—an Earth-sized planet orbiting an ultra-cool red dwarf star, located just 55 light years away from our own solar system.

This new planet, named SPECULOOS-3b, represents a major finding in the ongoing search for exoplanets that could potentially harbor life or provide insights into planetary formation and dynamics in varying stellar environments.

“SPECULOOS-3b is practically the same size as our planet,” stated the astronomer Michaël Gillon of the University of Liège in Belgium.

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The discovery was facilitated by the SPECULOOS project (Search for Planets EClipsing ULtra-cOOl Stars), which is a collaborative effort involving institutions such as the University of Liège in Belgium, the University of Birmingham, the University of Cambridge, the University of Bern, and the Massachusetts Institute of Technology.

Key Characteristics of Earth-sized Planet SPECULOOS-3b

SPECULOOS-3b is notably the second planet of its kind discovered orbiting this type of ultra-cool dwarf star. The planet completes an orbit around its host star approximately every 17 hours, marking a year on SPECULOOS-3b much shorter than a single Earth day. The host star itself is a fascinating celestial body; it is more than twice as cold as our Sun, ten times less massive, and a hundred times less luminous.

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Speculoos 3 Nasa

Due to its proximity to the star, SPECULOOS-3b is likely tidally locked, meaning that one hemisphere perpetually faces the star, basking in constant daylight, while the opposite hemisphere remains shrouded in perpetual darkness.

This peculiar arrangement raises intriguing questions about the climatic and environmental conditions that prevail on such a planet, potentially affecting its geological and atmospheric characteristics.

Challenges and Opportunities in Studying Ultra-cool Dwarf Stars

Ultra-cool dwarf stars, which are the primary targets of the SPECULOOS project, account for approximately 70% of all stellar bodies in our Milky Way galaxy. Despite their abundance, these stars present significant observational challenges due to their faint and widely dispersed nature across the sky.

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Studying these stars involves intensive monitoring over several weeks, requiring sophisticated technology and international collaboration to detect the minute dimming caused by planets like SPECULOOS-3b passing in front of them. However, the potential scientific rewards are substantial.

These stars have lifespans that are estimated to extend over 100 billion years, offering a stable long-term environment for potential life and making them excellent subjects for studying the long-term evolutionary processes of planets.

The Future of SPECULOOS-3b Research

The research team's future plans for SPECULOOS-3b are ambitious and aimed at unraveling more about this distant world. With the aid of the James Webb Space Telescope, astronomers hope to conduct follow-up observations that will delve deeper into the planet's surface and atmospheric properties.

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These observations will be crucial in determining the planet's mineral composition and assessing the likelihood of an atmosphere, which is generally considered unlikely due to the intense radiation levels from the nearby star. The harsh radiation environment and the planet's close proximity to its star pose challenges to the potential habitability of SPECULOOS-3b but also provide a unique opportunity to study planetary resilience to extreme stellar activity.

The discovery of SPECULOOS-3b is a testament to the ingenuity and persistence of the global astronomical community. It not only enhances our understanding of the types of planetary systems that exist within our galaxy but also paves the way for future discoveries that could further push the boundaries of our knowledge about the universe.

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As technology and methodologies advance, the search for exoplanets like SPECULOOS-3b continues to inspire both scientific inquiry and the imagination of people worldwide, bringing us closer to answering profound questions about our place in the cosmos.


An editor specializing in astronomy and space industry, passionate about uncovering the mysteries of the universe and the technological advances that propel space exploration.

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