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a, Side and top views of the event. The reconstructed trajectory of the muon is shown as a red line, along with an artist’s representation of the Cherenkov light cone. The hits of individual PMTs are represented by spheres stacked along the direction of the PMT orientations. Only the first five hits on each PMT are shown. As indicated in the legend, the spheres are coloured according to the detection time relative to the first triggered hit. The size of the spheres is proportional to the number of photons detected by the corresponding PMT. The locations of the secondary cascades, discussed in the Supplementary Material, are indicated by the black spheres along the muon trajectory. The north direction is indicated by a red arrow. A 100-m scale and the Eiffel Tower (330 m height, 125 m base width) are shown for size comparison. b, Zoomed-in view of the optical modules that are close to the first two observed secondary showers in the event. Here light-blue spheres represent hits that arrive within −5 to 25 ns of the expected Cherenkov arrival times.

Most Powerful Ghost Particle Ever Detected Unlocks New View of the Cosmos

Categories Physics & Mathematics

This infrasound monitoring station located in Antarctica is one of sixty such stations in the CTBT network designed to monitor secret nuclear tests.

The Silent Sound That Circles the Earth: Unlocking the Mysteries of Infrasound

Categories Earth, Energy & Environment, Physics & Mathematics

A (light green) bacterial cell detects a source of stress and becomes activated (dark green). It then produces alarmones (depicted as red triangles) and can transmit them to neighboring cells via cell-to-cell contact (black arrows). As the source of stress arrives, the percentage of activated cells increases, converting unstressed neighboring cells and triggering the stress response mechanism.

Bacteria’s Secret ‘Alarm System’ Against Antibiotics Uncovered

Categories Life & Non-humans

Artist's impression of a white hole.

The Mystery of White Holes: Could They Solve the Enigma of Dark Matter?

Categories Physics & Mathematics, Space

elite asian woman runner

New Math Model Reveals Optimal Strategies for Elite Runners

Categories Health, Physics & Mathematics

Digital reconstruction of the rampart network from the northern section of the Khaybar walled oasis 4,000 years ago.

Discovery of immense fortifications dating back 4,000 years in north-western Arabia

Categories Social Sciences

Quantum vacuum fluctuations, conceptual illustration.

Exploring vacuum energy

Categories Physics & Mathematics

(C) Joshua Resnick /Stock.adobe.com

Cryptocurrencies beyond the buzz

Categories Social Sciences, Technology

Dry toilet in Charles Léopold Mayer Foundation for Human Progress, in Paris.

A review of how wealthy societies dispose of their excrement

Categories Social Sciences

The Banque de France (French national bank) releases GDP growth projections for France, Germany and the Eurozone (December 2019).

Is the concept of GDP compatible with the envirnmental transition?

Categories Earth, Energy & Environment, Social Sciences

Singapore skyline at night

Sea level rise poses particular risk for Asian megacities

Categories Earth, Energy & Environment

Crystals generate electricity from heat

Categories Earth, Energy & Environment, Technology

A first molar from a Neanderthal, analysed for this study.

Meat good: Neanderthals appear to have been carnivores

Categories Life & Non-humans

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