NASA’s Webb Telescope Discovers Signs of Planet Orbiting Closest Solar Twin. Science news.

 Webb Telescope Uncovers Potential Planet Near Closest Star Like Our Sun .

Webb Telescope Uncovers Potential Giant Planet Orbiting Closest Solar Twin

Astronomers using NASA’s James Webb Space Telescope (JWST) have found compelling evidence of a giant exoplanet orbiting Alpha Centauri A, a Sun-like star just 4 light-years away from Earth. This finding could mark a breakthrough in the quest to detect planets beyond our solar system, especially those orbiting nearby stars.

Why Alpha Centauri Matters

The Alpha Centauri system is the closest stellar neighbor to our Sun. It consists of three stars:

• Alpha Centauri A – a bright, Sun-like star

• Alpha Centauri B – another Sun-like star in a tight orbit with A

• Proxima Centauri – a faint red dwarf already known to host three confirmed exoplanets

Despite its proximity, confirming planets around Alpha Centauri A and B has been notoriously difficult—until now.

Webb’s Breakthrough with MIRI

Using the Mid-Infrared Instrument (MIRI) aboard the Webb Telescope, astronomers conducted a detailed study of Alpha Centauri A in August 2024. By blocking out the star’s bright light using a coronagraph, the team identified a faint source nearly 10,000 times dimmer than Alpha Centauri A—likely a gas giant similar in mass to Saturn.

This potential planet is estimated to orbit its star at a distance between 1 and 2 AU (astronomical units)—placing it within the habitable zone, though its gaseous nature would make life as we know it impossible.

A Challenging Observation Yields Promising Results

“This is one of the hardest targets to observe,” said Charles Beichman of NASA’s Jet Propulsion Laboratory and co-author of the study. “Alpha Centauri is close, bright, and rapidly moving. Webb had to be custom-programmed for this unique mission—and it paid off.”

To confirm the object wasn’t a background galaxy or foreground asteroid, the research team ran extensive simulations and modeling, comparing the data to past observations, including a possible sighting by the Very Large Telescope in 2019.

Simulating a "Disappearing Planet"

Interestingly, the planet wasn’t visible in later Webb observations in February and April 2025—but scientists aren’t concerned. According to Aniket Sanghi, co-lead author and Caltech PhD student, “In half of our simulations, the planet simply moved too close to the star to be detected by Webb at that time.”

This scenario supports the idea of an elliptical orbit, explaining its periodic invisibility.

Implications for Planet Formation and Future Research

If confirmed, this would be:

• The closest directly imaged planet to a Sun-like star

• The most Earth-like in temperature and age among known gas giants

• A significant challenge to current models of how planets form in complex, multi-star systems

"This could completely reshape our understanding of planetary formation in binary star systems,” Sanghi explained.

Looking Ahead: Future Missions and Deeper Insights

The Nancy Grace Roman Space Telescope, scheduled for launch by 2027, could further investigate Alpha Centauri. Roman’s visible light instruments will complement Webb’s infrared capabilities, potentially confirming the planet's reflectivity and size.

Webb’s Mission Continues

As NASA’s most advanced space observatory, the James Webb Space Telescope is revealing never-before-seen aspects of our universe—from distant galaxies to nearby exoplanets.

This discovery is a major milestone in humanity’s search for other worlds—and it's happening in our cosmic backyard.

see more........ 

💥Tags:-
Alpha Centauri, Webb Telescope discovery, NASA exoplanet search, gas giant near Earth, Alpha Centauri A planet, closest solar twin, MIRI observations, habitable zone, exoplanet imaging, space science 2025, Webb space telescope news, NASA discoveries, Saturn-like planet, James Webb infrared