Star-eating black hole could power cosmic particle accelerator

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Nature Podcast
16 October 2024

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A type of binary-system known as a microquasar has been found to be firing out γ-rays at high energy-levels, which may make it a candidate to be a long-theorized natural particle-accelerator known as a PeVatron. These objects are thought to be a source of galactic cosmic rays, the origins of which are currently a mystery.

Understanding how this microquasar works could also help researchers learn more about full-sized quasars — monstrous objects centred around supermassive black holes, which are too distant to study easily.

Research Article:

Alfaro et al.

News and Views:

High-altitude particle detector spots a second Galactic microquasar

The comb jellies caught fusing their bodies, and an ancient burial site reveals that Classical accounts of Scythian culture appear to be true.

Research Highlight:

Two comb jellies fuse their bodies and then act as one

Research Highlight:

Evidence of dead people posed on dead horses found in ancient tomb

Researchers have developed a modified insulin-molecule that varies its level of activity depending on blood-glucose levels. It’s hoped that this ‘smart’ insulin could one day help those with diabetes regulate their blood sugar more easily.

Many people with diabetes rely on regular insulin injections, but because blood-sugar levels can be difficult to predict it can be hard to select the correct dose. This can lead to hypoglycaemia — a life-threateningly low level of glucose. To overcome this, a team created a modified form of insulin with a switch that activates the molecule when glucose levels are high, and deactivates it when levels are low. This insulin-molecule was effective at maintaining correct blood glucose in animal models, and may eventually help lessen diabetes-related complications in humans.

Research Article:

Hoeg-Jensen et al.

News and Views:

Smart insulin switches itself off in response to low blood sugar

Ancient DNA confirms that infamous lions hunted humans and a variety of game, and a new technique can sequence a cell’s DNA and pinpoint its proteins, without cracking it open.

Nature:

Famed lions’ full diet revealed by DNA — and humans were among their prey

Nature:

‘Phenomenal’ tool sequences DNA and tracks proteins — without cracking cells open

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