Astronomers Uncover New Earth-Sized Planet in Nearby Star System
In a groundbreaking discovery, astronomers have identified a new Earth-sized planet orbiting a sun-like star approximately 146 light-years from Earth. This finding has ignited fresh interest in nearby worlds that could potentially support life, according to a recent study published in The Astrophysical Journal Letters on Tuesday.
Discovery and Analysis of HD 137010 b
The candidate planet, designated as HD 137010 b, was detected using data from NASA’s Kepler space telescope’s K2 mission, which was collected in 2017. An international research team, led by Alexander Venner from the University of Southern Queensland (USQ), conducted the analysis. Their work highlights the planet's estimated size, which is about 6% larger than Earth, and its orbital period of roughly 355 days.
Habitable Zone Potential and Surface Conditions
Researchers have calculated that HD 137010 b has about a 50% chance of residing in the habitable zone of its star, where conditions might allow for liquid water. However, the study notes that its surface temperature could be closer to that of Mars, potentially dropping below –94°F (–70°C), which poses challenges for life as we know it.
Significance of Proximity and Future Observations
Co-author Chelsea Huang of USQ emphasized the excitement surrounding this discovery, stating, "What’s very exciting about this particular Earth-sized planet is that its star is only [about] 150 light-years away from our solar system." This relative proximity makes it a promising target for future telescopes. Huang added, "The next best planet around a sun-like star, in a habitable zone, [Kepler-186f] is about four times farther away and 20 times fainter."
Role of Citizen Scientists and Future Missions
The faint signal that revealed HD 137010 b was initially flagged by citizen scientists, including lead author Alexander Venner. He shared, "I contributed to this citizen science project called Planet Hunters back when I was in secondary school, and it was a big part of how I got into research." Looking ahead, Venner noted that future space missions, such as the NASA Habitable Worlds Observatory, may be capable of directly imaging Earth-like planets, including HD 137010 b.
This discovery underscores the ongoing efforts in astronomy to explore exoplanets and assess their potential for habitability, bringing us one step closer to understanding our place in the universe.
