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Posts by Peter Laursen
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The brightest explosion ever seen
Gamma-ray bursts are the most energetic explosions in the Universe, marking the end of a star’s life. A particularly bright burst was recently detected by several space telescopes. A team of scientists led by astronomers at the Cosmic Dawn Center measured the exact distance to the burst, allowing them to calculate the total energy released: During its duration of just five minutes it released much more energy than our Sun has emitted throughout its lifetime of 4½ billion years, making the burst the single most energetic ever detected.
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Den kraftigste eksplosion nogensinde set
Gammaglimt er de kraftigste eksplosioner i Universet, og markerer afslutningen på en stjernes liv. Et særlig kraftigt glimt blev for nylig observeret af flere rumteleskoper. Et team af forskere, ledet af astronomer ved Cosmic Dawn Center, målte den nøjagtige afstand til eksplosionen, hvilket gjorde det muligt for dem at beregne den totale udløste energi: I løbet af de blot fem minutter, glimtet varede, udløste det mere energi, end vores Sol har udsendt gennem hele sit 4½ milliarder år lange liv. Dette gør glimtet til det mest energirige, der nogensinde er opdaget.
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Astrophysicists unveil the unexpected symmetry of cosmic explosions
Although the magnificent explosion of colliding neutron stars is visible across most of the Universe, the resulting fireball is much too small to study in detail. But now astronomers from the Cosmic Dawn Center has found a way to measure the shape of the explosion. The surprising result provides new insight into fundamental physics relating to the formation of heavy elements and the birth a black holes. The study has just been published in the scientific journal Nature.
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Astrofysikere afslører kosmisk eksplosions overraskende symmetri
Selvom den spektakulære eksplosion af kolliderende neutronstjerner er synlig på tværs af det mest af Universet, er den resulterende ildkugle alt for lille til at kunne se nogen detaljer. Men nu har astronomer fra Niels Bohr Institutet fundet en måde at måle eksplosionens struktur på. Det overraskende resultat giver ny indsigt i den fundamentale fysik, som beskriver dannelsen af tunge grundstoffer og fødslen af et sort hul. Studiet er netop blevet offentliggjort i tidsskriftet Nature.
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Astro-Pic Of the Day
- NGC 7635: The Bubble NebulaWhat created this huge space bubble? Blown by the wind from a star, this tantalizing, head-like apparition is cataloged as NGC 7635, but known simply as the Bubble Nebula