tag #stellar 9 reading cards on “stellar”, in chronological order. Part of the full archive. 2026-05-26 The Cepheids How a pulsating star became the ruler of the universe. Some stars do not shine steadily. They swell and contract on a clockwork rhythm — and the rhythm itself, it turns out, tells us how far away they are. 2026-05-15 Binary Pulsars Clocks in motion, watched by clocks — and sometimes, mid-experiment, the clock turns away. A pulsar locked in orbit with another compact body becomes a moving timepiece whose ticks can be tracked to nanoseconds. That precision is what makes binary pulsars the most demanding laboratory we have for gravity — and what occasionally reveals that one of them has stopped pointing at us. 2026-05-12 The First Pulsar A signal that should not have existed. In the summer of 1967, a twenty-four-year-old graduate student in Cambridge found a rhythm buried in the radio noise — sharp, cold, perfectly repeating every 1.337 seconds. For weeks, no one could explain it. They half-jokingly labelled it LGM-1: Little Green Men. 2026-05-07 Stellar Collisions When stars meet — violently. A direct hit between two stars is exceedingly rare in the disc of the Galaxy. In the dense cores of globular clusters, it is routine. 2026-05-07 Giant Molecular Clouds Stellar nurseries written in cold hydrogen and dust. Most of interstellar space is too hot and too sparse for atoms to ever meet. But cold, dense pockets exist — and that is where stars come from. 2026-05-07 The Story of Stars From the dust of molecular clouds to the light that reaches our telescopes. Stars are not visible at the moment of their birth. To find one being made, we have to point a radio telescope at a place where, on the surface, nothing seems to be happening. 2026-05-07 Our Sun An extraordinarily complex star hiding behind an apparently simple glow. The Sun appears to the eye as a featureless ball of light. A century of observation has shown it to be the most layered, most paradoxical star we will ever study at close range. 2026-05-07 The Solar Neighbourhood Interstellar matter flows through our planetary system — and has for billions of years. The Solar System is not sailing through empty space. It is moving through a cloud — and through that cloud's history. 2026-05-07 The Cosmic Distance Ladder Measuring the universe — one rung at a time. Astronomy began as the art of estimating how far things are. The trick is that no single method works at every scale — so we built a ladder.
