Supernova's light curve baffles scientists. (supernova 1987A)

Science News | October 19, 1991| | Copyright

More than four years after light from supernova 1987A first reached Earth, radiation remains the key tool for investigating the hidden energy sources powering this exploded star. Soon after the supernova appeared, emissions of ultra-violet, infrared and visible light grew steadily fainter, following a predicted decay curve. But changes in the supernova's "light curve" over the past year now leave astronomers puzzled.

The changes hint at two dramatic possibilities: the abundance of elements in 1987A may differ widely from that in our solar system, or a new energy ...

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