Thursday, September 17, 2026

Researchers Develop a Way to Check the Weather on a Exoplanet

An artist’s impression of the extrasolar world, SIMP 0136. Credit: Dr. Evert Nasedkin

Scientists from Trinity have developed a powerful way to unravel the changing weather patterns on distant worlds. Using this approach, they discovered that the weather on a well-studied brown dwarf, “SIMP 0136”, previously linked with Northern Lights-like phenomena, is largely shaped by just two dominant processes: changes in temperature and the vertical structure of its clouds.



A Zombie White Dwarf Star is Born Again. Hallelujah!

Sakurai's Object is an unusual star that is undergoing evolutionary changes on human timescales. Over thirty years, it has becomes six times brighter. This is due to a very late thermal pulse. As a result, it's transitioned from a white dwarf to a Wolf-Rayet type star, and is called a 'born again' star. The middle panel is an ALMA image that shows the expanding shell of material from the pulse. Image Credit: Stefan Kimeswenger, University of Innsbruck; Peter van Hoof, Royal Observatory Belgium

30 years ago, an amateur astronomer noticed a white dwarf star suddenly getting brighter. New research shows this is due to a Very Late Thermal Pulse, a type of helium flash. The star has heated up and become brighter, and is now called a 'born again' star. It's evolved into a Wolf-Rayet type star, and astronomers will get to watch as it continues to evolve on human timescales.



Wednesday, September 16, 2026

The Sun May Have Swallowed a Planet

An artist’s impression of a star engulfing a planet. The blue line traces the path of the planet as it spirals toward the star and ultimately collides with it.
NASA, ESA, CSA, Ralf Crawford (STScI)
Licence type
Attribution (CC BY 4.0)

New research suggests that some unusual characteristics of the Sun may be explained if it swallowed a large planet sometime during the Solar System’s formation.



Mercury is Shrinking, But Faster Than Previously Thought

Mercury as seen by NASA’s MESSENGER spacecraft in 2008. Credit: NASA/JHUAPL/Carnegie Institution of Washington

The rough, impact-debris-covered surface of Mercury has hidden the true rate at which Mercury has been shrinking, which scientists previously underestimated by 30%



When Stars Engulf Rocky Planets, Beryllium Gives It Away

This illustration shows a planet spiralling inwards, where it's engulfed by its star. Researchers have developed a method to determine which stars have eaten rocky planets. It's all based on the rare element Beryllium. Image Credit: NASA, ESA, CSA, Ralf Crawford (STScI).
Licence: Attribution (CC BY 4.0)

Astronomers know that stars can engulf planets when they stray too close. But how can they know, by looking at a star, if it has ever done so? The answer lies in Beryllium, an element not synthesized inside stars.



Webb Searches for Brown Dwarfs in a Stunning Star-Forming Region

The JWST captured this image of the star-forming region IC 348 with its NIRCam instrument. At 1,000 light years away, the region is relatively close to us. This makes it a good place to search for the lowest-mass brown dwarfs. Image Credit: ESA/Webb, NASA, CSA, K. Luhman, C. Alves De Oliveira, M. Zamani (ESA/Webb)

How small can brown dwarfs be before the definition breaks down? That question is at the heart of new research, and new JWST images. Using the space telescope, researchers have discovered a new class of brown dwarfs with low masses, marked by a peculiar hydrocarbon feature.



For Trans-Neptunian Objects, The Past Is Written On Their Surface

This artist’s concept depicts a Trans-Neptunian Object, a small, faint, icy body orbiting the Sun beyond the orbit of Neptune. Credit: NASA, ESA, Leah Hustak (STScI)

Some Trans-Neptunian Objects (TNOs) formed closer to the Sun and migrated to the outer solar system, while others formed there originally. A new study finds that "hot" and "cold" origin TNOs can be distinguished not only by their orbits, but also by their surface color.