Science news this week: Burping black holes and radioactive wild boars

Science news this week includes black holes that "burp" star matter and radioactive wild boars.
Science news this week includes black holes that "burp" star matter and radioactive wild boars. (Image credit: Sophia Dagnello, NRAO/AUI/NSF - John Ceulemans/Getty Images)

This week in science news we’ve seen black holes burping up stars, radioactive Bavarian wild boars and a rather ingenious use for spent coffee grounds.

So, what about those burping black holes? Astronomers have discovered that much like humans — who are prone to a little gaseous emission after a hearty meal — black holes emit a large amount of stellar remains years after devouring stars, and it could be affecting up to 50% of them. And if the universe wasn’t messy enough already, scientists have identified a new class of cosmic explosion brighter than 100 billion suns. Closer to Earth, there are claims that NASA might have found alien life on Mars and then accidentally destroyed it, while in our skies we’ve witnessed a fireball meteor turning the sky green and an unusual lightning 'sprite' — one of nature's least understood phenomena.

From up in the skies to deep underground, a 16-year-old student has discovered a 34 million-year-old whale skull in an Alabama timber farm during a summer school project — that’s going to be hard to beat at show and tell. Other treasures brought to the surface this week include four Roman swords, ancient Greek figurines thought to be offerings to Poseiden, a Bronze Age girl buried with 150 animal ankle bones, and a mysterious golden orb that has left scientists baffled as to what it could be.

In health news, the Centers for Disease Control and Prevention issued a warning after five people were killed by 'flesh-eating' bacteria; we explained everything you need to know about this year’s flu shot; and we saw how DNA's 'topography' influences where cancer-causing mutations appear.

For those of us who like strong coffee, it turns out those spent grounds could have an unexpected second life — making concrete up to 30% stronger, while elsewhere at the breakfast table we discovered what gives pink pineapples their distinctive color. If the thought of genetically modified fruit turns your stomach, spare a thought for German wild boars, whose penchant for truffles means their levels of radioactivity are far higher than other animals in the area — now we know why.

And finally, continuing with the theme of food-focused science news, we couldn't let you go without knowing that scientists have finally figured out why cats are obsessed with tuna.

Picture of the week

The construction site of the Extremely Large Telescope in Chile's Atacama Desert is silhouetted against the rising sun displaying sunspots.

(Image credit: E. Garcés/ESO. Ack.: N. Dubost)

This glorious silhouette, published Sept. 4, 2023, shows the Extremely Large Telescope (ELT) being built in the Atacama Desert in Chile. When it begins operations in 2028, it will be the world's largest telescope and will enable astronomers to search other star systems for habitable exoplanets, probe dark matter and dark energy, study black holes, and see the very first galaxies back to just 380,000 years after the Big Bang.

The picture also shows just how active the sun is right now, with small (yet actually planet-size) sunspots on its surface. It's thought that sunspots will continue to increase as the sun nears solar maximum, which could arrive as soon as the end of this year.

Weekend reading

And finally...

World map of global temperatures in July, 2023.

(Image credit: NASA)

The summer has been characterized by relentless heat waves around the world. Now, data released this week by the World Meteorological Organization (WMO) confirms that Earth just had its hottest summer in recorded history — yet another sign that climate change is happening.

Climate breakdown has begun.

U.N. secretary-general António Guterres

"Our planet has just endured a season of simmering — the hottest summer on record," U.N. secretary-general António Guterres said in a statement. "Climate breakdown has begun."

Global sea-surface temperatures have been especially high over the past five months and remained at record-high levels throughout April, May, June and July 2023. In August 2023, the sea-surface temperature was 69.76 degrees Fahrenheit (20.98 degrees Celsius), surpassing the previous March 2016 heat record every single day that month.

And this is all happening before we see the full impact of this year's El Niño weather event, which itself is expected to see ocean temperatures "substantially exceed" those recorded during the last strong event in early 2016.

Editor-in-Chief, Live Science

Alexander McNamara is the Editor-in-Chief at Live Science, and has more than 15 years’ experience in publishing at digital titles. More than half of this time has been dedicated to bringing the wonders of science and technology to a wider audience through editor roles at New Scientist and BBC Science Focus, developing new podcasts, newsletters and ground-breaking features along the way. Prior to this, he covered a diverse spectrum of content, ranging from women’s lifestyle, travel, sport and politics, at Hearst and Microsoft. He holds a degree in economics from the University of Sheffield, and before embarking in a career in journalism had a brief stint as an English teacher in the Czech Republic. In his spare time, you can find him with his head buried in the latest science books or tinkering with cool gadgets.