Assertion: millisecond pulsar | /r/HasProperty | psr b1937
Facets:
Source sentences:
text: In 1982, Don Backer and colleagues discovered the first millisecond pulsar, PSR B1937+21.
text: In 1982, Don Backer and colleagues discovered the first millisecond pulsar, PSR B1937+21.
text: The first millisecond pulsar, PSR B1937+21, was discovered in 1982 by Backer et al.