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It may be old, but it ain't dead. The Chandra X-Ray Observatory has found the oldest isolated pulsar ever detected. While this pulsar is ancient, this exotic object is still kicking and is surprisingly active.
According to radio observations, the pulsar, PSR J0108-1431 (J0108 for short) is about 200 million years old. Among isolated pulsars — ones that have not been spun-up in a binary system — it is over 10 times older than the previous record holder.
At a distance of 770 light years, it is also one of the nearest pulsars we know of.