Mystery of star explosion 2000 years ago solved

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　　The supernova, an exploded star, was observed in 185 A.D. and documented as a mysterious "guest star" by Chinese astronomers. It was visible for eight months.

　　Scientists later found the supernova, 8,000 light years away, was a bigger-than-expected supernova remnant. BBC reported that if the infrared³ light it emits could be seen by human eyes, it would appear to be as large as the full Moon in the sky.

　　Through observations in space telescopes, researchers of a latest study revealed that the explosion took place in a cavity in space, which allowed the star's remains⁴ to travel out much faster and farther. The study was published online in the Astrophysical Journal Monday.

　　The supernova was "two to three times bigger than we would expect for a supernova that was witnessed exploding nearly 2,000 years ago. Now, we've been able to finally pinpoint⁵ the cause," stated Brian Williams, lead author of the study and an astronomer¹ at North Carolina State University in Raleigh.

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