Shocks in a distant gamma-ray burst

Gamma ray bursts (GRBs) — flashes of high-energy light occurring about once a day, randomly, from around the sky — are the brightest events in the known universe. While a burst is underway, it is many millions of times brighter than an entire galaxy. Astronomers are anxious to decipher their nature as their tremendous brightness opens windows into the young universe.

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Cosmic recycling in the Prawn Nebula

Dominating this image is the so-called Prawn Nebula, part of the gigantic nebula Gum 56, some 6,000 light-years away in Scorpius. For millions of years stars have been born out of the nebula’s gas, material which is later returned to the stellar nursery when the aging stars either expel their material gently into space, or eject it more dramatically in supernova explosions.


Exiled stars explode far from home

Hubble Space Telescope images confirm that three supernovae discovered several years ago exploded in the dark emptiness of intergalactic space — their nearest neighbours probably 300 light-years away — having been flung from their home galaxies millions or billions of years earlier.