Using the light of almost 2,000 stars, astronomers measured the density of the gas surrounding our sun to create a new map of interstellar space. Scientists estimate that several million years ago a supernova explosion wiped out a large area of space, leaving an area with no gas and only a handful of hydrogen atoms. By using 3-D technology to map out this previously unknown area, astronomers are able to fill in major blanks in our knowledge about the galaxy.


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