Title: Scientists Uncover Planet Similar to Earth, SPECULOOS-3 b, in Orbit Around a Remarkably Cold Star

A group of astronomers has recently discovered an Earth-sized planet, SPECULOOS-3 b, revolving around an ultra-cool star. This newly discovered celestial body is one of the latest additions to the growing number of exoplanets—planets that orbit a star outside the solar system—that bear similarities to Earth in terms of their size.

The planet, christened as SPECULOOS-3 b, was discovered using the Search for habitable Planets EClipsing ULtra-cOOl Stars (SPECULOOS) facility, a network of telescopes located in the Atacama Desert in Chile. The facility’s primary goal is to identify and study terrestrial planets in orbits around nearby ultra-cool stars, a category that includes both brown dwarfs and the smallest stars.

SPECULOOS-3 b is located approximately 40 light-years away from Earth, orbiting a star that is about 12% the size of our Sun. The star is also an ultra-cool dwarf star, a category of stars that are cooler and less luminous than our Sun. These stars are also less massive, allowing planets in their orbit to be detected more easily.

The planet orbits its star in just four Earth days, a significantly shorter period than Earth’s 365-day orbit around the Sun. This close proximity to its star means that SPECULOOS-3 b is likely too hot to support life as we know it. However, the discovery of this planet provides a valuable opportunity for scientists to study the atmospheres of Earth-sized exoplanets in detail.

Notably, this discovery is of particular interest as it suggests that ultra-cool dwarf stars could host a considerable number of terrestrial planets. Because these stars are common in the Milky Way, it means there could be a significant number of Earth-sized planets waiting to be discovered. These planets could potentially provide the conditions necessary for life to exist, especially if they are located in the habitable zones of their stars.

Astronomers used the transit method to detect SPECULOOS-3 b. This method involves observing the star’s light for periodic dips in intensity, which indicate a planet is passing in front of the star from the observer’s viewpoint. The transit method can provide information about the planet’s size, orbit, and even some characteristics of its atmosphere.

The discovery of SPECULOOS-3 b is a significant step forward in the search for exoplanets, especially those that are similar to Earth. While the inhospitable conditions on this planet make it unlikely to support life, it serves as a reminder of the vast and varied nature of the universe. The more we learn about these distant planets, the more we can understand about our own place in the cosmos.

The discovery of SPECULOOS-3 b adds to the growing list of over 4,000 confirmed exoplanets. This discovery underlines the importance and effectiveness of ongoing exoplanet search projects, such as SPECULOOS. As technology and methodology continue to improve, astronomers are hopeful of finding more Earth-like planets around ultra-cool stars, leading to potentially groundbreaking discoveries in the field of astrobiology and the ongoing quest to find extraterrestrial life.


Astronomers have identified a new Earth-sized exoplanet called SPECULOOS-3 b, which orbits a red dwarf star within our galaxy. Red dwarf stars are prevalent in the Milky Way, making up over 70% of all stars. These stars emit a cooler, dimmer light than our Sun and have a lifespan exceeding 100 billion years, offering fascinating opportunities for the potential existence of life.

SPECULOOS-3 b was discovered by an international team of scientists using robotic telescopes stationed around the globe. The exoplanet orbits its host star about 55 light-years away from Earth, a relatively close distance in cosmic terms. One of the unique characteristics of this new exoplanet is its tidally locked nature, similar to how one side of our Moon is always lit, while the other side remains in constant darkness.

The star that SPECULOOS-3 b orbits is considerably cooler than our Sun, with a temperature around 4,760 degrees Fahrenheit (2,627 degrees Celsius). Despite its relatively dim light, the star bombards its orbiting planet with intense radiation, suggesting the planet likely does not have an atmosphere.

This discovery is part of the SPECULOOS (Search for Planets EClipsing ULtra-cOOl Stars) project, led by Michael Gillon from the University of Liège in Belgium. The project’s goal is to study nearby ultra-cool dwarf stars and their planetary systems using a network of advanced telescopes.

The close proximity of SPECULOOS-3 b to its star means the planet receives about 16 times more solar energy than Earth, which greatly affects its surface conditions and climate dynamics. Future research plans include using the James Webb Space Telescope for further observations to understand more about the exoplanet’s atmospheric composition and surface characteristics.

Steve B. Howell from NASA Ames Research Center in Silicon Valley highlighted the progress in studying planets orbiting other stars, stating that they have now reached a point where they can detect and study Earth-sized exoplanets in detail. The next objective is to determine if any of these exoplanets could potentially support life.

The discovery of SPECULOOS-3 b is a significant step forward in astronomy. It provides invaluable insights into the characteristics of exoplanets and their host stars, paving the way for further exploration and understanding of our universe. The study’s findings were published in the journal Nature Astronomy.



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