Gamma-ray explosions normally last a couple of daysReminiscent of a space invaders computer game from the early 1980s, this is actually a cosmic blast in a distant galaxy.
The extraordinary gamma-ray explosion was observed on March 28 by Nasa's Swift satellite.
It has left astronomers scratching their heads - because it has so far lasted an incredible 11 days.
Flaring from such an event usually lasts a couple of hours.
But scientists are perplexed by this blast because, unusually, the effects are so long-lasting.
More than a week later, they are continuing to see high-energy radiation spiking and fading at the source.
The burst was likely caused by a star that was ripped apart after drifting too close to a super-massive black hole. Read More
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