By comparing new Hubble observations with images first taken in 1999, astronomers traced the continuing expansion of one of the sky’s most studied supernova remnants, energized by a rapidly spinning pulsar at its core. By comparing new Hubble observations with images first taken in 1999, astronomers traced the continuing expansion of one of the sky’s most studied supernova remnants, energized by a rapidly spinning pulsar at its core. In 1054, Chinese astronomers we... [4057 chars]
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