New Laser Technique May Help Find Supernova

I'm always amazed by all the applications for which  laser can be used.When a supernova explodes, it it spreads matter in a vast area of space. The resulting mass  cools and eventually forms other stars and planets, that contain proof of that supernova's existence.
One single atom of a certain isotope of hafnium found on Earth would prove that a supernova once exploded near our solar system. The problem is how to find such an atom - among billions of others. Researchers at the University of Gothenburg, Sweden, have developed a laser technique that, in combination with standard techniques, may be able to do the job.
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