Ball-Sized Hailstone in Argentina

This is a file photo of hailstones estimated to be tennis ball-sized. Photo Credit: Gregory_DUBUS (iStock)
This is a file photo of hailstones estimated to be tennis ball-sized. Photo Credit: Gregory_DUBUS (iStock)
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Ball-Sized Hailstone in Argentina

This is a file photo of hailstones estimated to be tennis ball-sized. Photo Credit: Gregory_DUBUS (iStock)
This is a file photo of hailstones estimated to be tennis ball-sized. Photo Credit: Gregory_DUBUS (iStock)

A powerful storm that hit Villa Carlos Paz in Argentina two years ago produced the world's largest hailstone, bigger than a volleyball, a US research team reported.

A hailstone is a lump of ice that has a round or irregular shape, ranging in diameter from a few millimeters to several centimeters. The researchers who examined the incident in 2018 found that at least one hailstone measured up to 9.3 inches in diameter, potentially setting a new world record.

The current record belongs to a hailstone that measured 8 inches across, or about the size of a volleyball, that fell near Vivian, South Dakota. But, according to a recent study by researchers from the Penn State University, the hail that fell in Argentina is bigger. The study was published in the Bulletin of the American Meteorological Society.

In a report published Thursday on the university's website, Matthew Kumjian, associate professor at Penn State University said: "It's incredible. This is the extreme upper end of what you'd expect from hail."

Scientists suggest that hailstones bigger than six inches should be classified as gargantuan hail. Being aware of such rare events could help form a better understanding of dangerous storms.

"Anything larger than about a quarter of that in size can start putting dents into your car – in some rare cases, six-inch hail has actually gone through roofs and multiple floors in houses. We'd like to help mitigate the impacts on life and property, to help anticipate these kinds of events," said Kumjian.

Residents of Villa Carlos Paz had shared pictures and videos showing the falling hailstones on social media. The researchers followed their accounts a year after the storm, interviewed witnesses, and visited the damaged sites. Based on the collected photo data and the analysis of radar observations, along with the measurements of photogrammetry and video evidence, the scientists estimated that the hailstone may have set a new world record.

"Such a well-observed case is an important step forward in understanding environments and storms that produce gargantuan hail, and ultimately how to anticipate and detect such extreme events, especially that predicting the size of the stones remains challenging for scientists," concluded Kumjian.



Who Are the NASA Astronauts Who Have Been Stuck in Space for 9 Months?

This image taken from NASA video shows the SpaceX capsule carrying NASA astronauts Suni Williams, Butch Wilmore and Nick Hague, and Russian astronaut Alexander Gorbunov, undocking from the International Space Station on Tuesday, March 18, 2025. (NASA via AP)
This image taken from NASA video shows the SpaceX capsule carrying NASA astronauts Suni Williams, Butch Wilmore and Nick Hague, and Russian astronaut Alexander Gorbunov, undocking from the International Space Station on Tuesday, March 18, 2025. (NASA via AP)
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Who Are the NASA Astronauts Who Have Been Stuck in Space for 9 Months?

This image taken from NASA video shows the SpaceX capsule carrying NASA astronauts Suni Williams, Butch Wilmore and Nick Hague, and Russian astronaut Alexander Gorbunov, undocking from the International Space Station on Tuesday, March 18, 2025. (NASA via AP)
This image taken from NASA video shows the SpaceX capsule carrying NASA astronauts Suni Williams, Butch Wilmore and Nick Hague, and Russian astronaut Alexander Gorbunov, undocking from the International Space Station on Tuesday, March 18, 2025. (NASA via AP)

Butch Wilmore and Suni Williams were barely known outside space circles when they strapped in for what was supposed to be a quick test flight of Boeing's Starliner capsule last June. Nine months later, they've captured the world's attention — and hearts — as NASA's stuck astronauts.

Their homecoming is imminent now that a new crew has arrived at the International Space Station to replace them after launching from Florida last week. They're flying back with SpaceX, their problem-plagued Starliner having returned to Earth empty months ago, leaving them behind in orbit. Their SpaceX capsule undocked from the station early Tuesday for the 17-hour ride home, The AP reported.

Here's a look at “Suni and Butch” and their drama-filled mission:

Who are the stuck astronauts? The two test pilots came to NASA via the Navy. Wilmore, 62, played high school and college football in his home state of Tennessee before joining the Navy. Williams, 59, grew up in Needham, Massachusetts, a competitive swimmer and distance runner.

Wilmore racked up 663 aircraft carrier landings, while Williams served in combat helicopter squadrons.

NASA picked Williams as an astronaut in 1998 followed by Wilmore in 2000. Each had two spaceflights behind them including monthslong stints at the space station before signing up as Starliner's first crew.

While they accepted their repeated homecoming delays, they noted it was much harder on their families. Wilmore’s wife Deanna has held down the fort, according to her husband. Their oldest daughter is in college and their youngest in her last year of high school.

Williams’ husband, Mike, a retired federal marshal, has been caring for their two Labrador retrievers. She said her mother is the worrier.

What are the stuck astronauts looking forward to on Earth? Besides reuniting with loved ones, Wilmore, an elder with his Baptist church, can’t wait to get back to face-to-face ministering and smelling fresh-cut grass.

Wilmore kept in touch with members of his congregation over the months, taking part in occasional prayer services and calling ailing members via the space station's internet phone.

Williams looks forward to long walks with her dogs and an ocean swim.

Several other astronauts have spent even longer in space so no special precautions should be needed for these two once they're back, according to NASA.

“Every astronaut that launches into space, we teach them don't think about when you're coming home. Think about how well your mission's going and if you're lucky, you might get to stay longer,” NASA's space operations mission chief and former astronaut Ken Bowersox said last week.

Why were the stuck astronauts in a political dust-up? Wilmore and Williams found themselves in the middle of a political storm when President Donald Trump and SpaceX founder Elon Musk announced at the end of January they would accelerate the astronauts' return and blamed the Biden Administration on keeping them up there too long.

NASA officials stood by their decision to wait for the next scheduled SpaceX flight to bring them home, targeting a February return. But their replacements got held up back on Earth because of battery work on their brand new SpaceX capsule.

SpaceX switched capsules to speed things up, moving up their return by a couple of weeks. The two left the space station in the capsule that's been up there since last fall; Williams blew kisses to the seven station residents staying behind.

“It’s great to see how much people care about our astronauts,” Bowersox said, describing the pair as “professional, devoted, committed, really outstanding.”

Why did the stuck astronauts switch space taxis? Astronauts almost always fly back in the same spacecraft they launched in. Wilmore and Williams launched aboard Boeing's Starliner and transferred to SpaceX's Dragon for the ride back.

Their first flights were aboard NASA's space shuttle, followed by Russia's Soyuz capsule. Both the Starliner and Dragon are completely autonomous but capable of manual command if necessary.

As test pilots, they were in charge of the Starliner. The Dragon had fellow astronaut Nick Hague in command; he launched in it last September with a Russian and two empty seats reserved for Wilmore and Williams.

What's the future of Boeing's Starliner? Starliner almost didn't make it to the space station. Soon after the June 5 liftoff, helium leaked and thrusters malfunctioned on the way to the orbiting lab.

NASA and Boeing spent the summer trying to figure out what went wrong and whether the problems would repeat on the flight back, endangering its two test pilots. NASA ultimately decided it was too risky and ordered the capsule back empty in September.

Engineers are still investigating the thruster breakdowns, and it's unclear when Starliner will fly again — with astronauts or just cargo. NASA went into its commercial crew program wanting two competing U.S. companies for taxi service for redundancy's sake and stand by that choice.