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100m-Wide Meteor Hit Antarctica 430,000 Years Ago

In a photo taken 10/22/17, near Malaga, Spain, a meteor is seen streaking past the constellation Canis Minor during the annual Orionid meteor showers. (Reuters)
In a photo taken 10/22/17, near Malaga, Spain, a meteor is seen streaking past the constellation Canis Minor during the annual Orionid meteor showers. (Reuters)
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100m-Wide Meteor Hit Antarctica 430,000 Years Ago

In a photo taken 10/22/17, near Malaga, Spain, a meteor is seen streaking past the constellation Canis Minor during the annual Orionid meteor showers. (Reuters)
In a photo taken 10/22/17, near Malaga, Spain, a meteor is seen streaking past the constellation Canis Minor during the annual Orionid meteor showers. (Reuters)

Research led by a Kent-based space scientist has uncovered new evidence of meteor particles reaching the Antarctic ice sheet 430,000 years ago. The team said the findings highlight the importance of reassessing the threat of medium-sized asteroids, with the potential for destructive consequences, reported The Metro.

Researchers recovered extra-terrestrial particles on the summit of Walnumfjellet within the Sor Rondane Mountains in east Antarctica. The discovery indicated a so-called low-altitude meteoritic touchdown event – where a jet of melted and vaporized material from an asteroid at least 100 meters in size reached the surface at high velocity.

The impact covered a circular area of around 2,000km – an almost-continental scale distribution, said Dr. Matthias van Ginneken from the University of Kent's School of Physical Sciences.

The research, published in the Science Advances journal, said finding evidence of such events remains critical to understanding the impact history of Earth and estimating hazardous effects of asteroid impacts.

Ginneke said while it is highly unlikely that such an event would happen over a densely-populated area – with less than 1 percent of the surface of the earth considered densely populated – its effects can be widespread.

"Severe effects of such an impact can be felt over hundreds of kilometers. Therefore, even if such an impact were to occur hundreds of kilometers away from a densely populated area, the amount of devastation would not be negligible and would need to be taken into account", he said.

Ginneken said the study could help improve knowledge of the rate of such impacts in the past and therefore how often these might happen in the future. The paper states that these events are potentially entirely destructive over a large area, corresponding to the area of interaction between the hot jet and the ground.

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Berliners Jump into the Spree River to Show It’s Clean Enough for Swimming 

People swim in the river Spree to demand the lift of the hundred years old swimming ban at the river in front of the Berlin Cathedral and the TV Tower in Berlin, Germany, Tuesday, June 17, 2025. (AP)
People swim in the river Spree to demand the lift of the hundred years old swimming ban at the river in front of the Berlin Cathedral and the TV Tower in Berlin, Germany, Tuesday, June 17, 2025. (AP)
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Berliners Jump into the Spree River to Show It’s Clean Enough for Swimming 

People swim in the river Spree to demand the lift of the hundred years old swimming ban at the river in front of the Berlin Cathedral and the TV Tower in Berlin, Germany, Tuesday, June 17, 2025. (AP)
People swim in the river Spree to demand the lift of the hundred years old swimming ban at the river in front of the Berlin Cathedral and the TV Tower in Berlin, Germany, Tuesday, June 17, 2025. (AP)

A century after the city of Berlin banned swimming in the Spree River because it was so polluted it could make people sick, there's a push by swimmers to get back into the water.

Around 200 people jumped into the slow-moving, greenish water Tuesday to show that it's not only clean enough, but also lots of fun to splash and swim in the Mitte neighborhood along the world-famous Museum Island.

A group calling itself Fluss Bad Berlin, or River Pool Berlin, has been lobbying for years to open the meandering river for swimmers again.

“For 100 years now, people have not been allowed to swim in the inner-city Spree and we no longer think this is justified, because we can show that the water quality is usually good enough to go swimming during the season,” said Jan Edler, who is on the board of Fluss Bad Berlin and helped organize Tuesday's swim-in.

To circumvent the ban, the group registered their collective swim event as an official protest.

Standing on a little staircase that leads down to the Spree canal, which flows around the southern side of the island, Edler stressed that “we want the people to use the Spree for recreation again.”

He pointed to the fact that the river has been cleaned up thoroughly, and that the water quality has improved in the last decade and is constantly being monitored.

Even city officials in the central Mitte district of Berlin say they'd be interested in introducing river swimming again in 2026.

“There are still many things that need to be clarified, but I am optimistic that it can succeed,” district city councilor Ephraim Gothe told German news agency dpa recently.

Supporters of lifting the swimming ban also point at Paris, where the Seine River was opened up for swimmers for the Olympic Games last year and will be opened this summer for Parisians. Swimming there had been banned since 1923.

In Vienna, too, water lovers can splash into the Danube River canal, in the Swiss city of Basel they can bathe in the Rhine, and in Amsterdam there are some designated areas where people can plunge into the canals.

Only in Berlin, swimming has been continuously prohibited in the Spree since May 1925, when the German capital closed all traditional river pools because the water was deemed too toxic. Some of those pools weren't only used for recreational swimming, but were a place for poor people to wash themselves if they didn't have bathrooms at home.

These days, the water is clean on most days, except when there's heavy rain, which leads to some water pollution.

Allowing swimmers to dive into the river would also mean loosening the historical monument protection on some parts of the riverbanks to install easy access ways to the water and places for lifeguards.

Another problem is the busy boat traffic on the Spree that could endanger swimmers. However, for the time being, the Fluss Bad Berlin group only wants to open up nearly 2-kilometer-long (just over a mile-long) canal where there's no boat traffic.

For what it's worth, the German capital, a city of 3.9 million, could definitely need more places where people can cool off in the summer as regular outdoor pools tend to be hopelessly overcrowded on hot summer days.

“The cities are getting hotter,” Edler said. “It's also a question of environmental justice to create offers for people who just can’t make it out of the city when it’s so hot and can enjoy themselves in the countryside.”