Classifier Instance:

Anchor text: PSR 1257+12
Target Entity: PSR_B1257\u002b12
Preceding Context: On 21 April 1992, radio astronomers Aleksander Wolszczan and Dale Frail announced the discovery of two planets orbiting the pulsar
Succeeding Context: . This discovery was confirmed, and is generally considered to be the first definitive detection of exoplanets. These pulsar planets are believed to have formed from the unusual remnants of the supernova that produced the pulsar, in a second round of planet formation, or else to be the remaining rocky cores of gas giants that somehow survived the supernova and then decayed into their current orbits.
Paragraph Title: Confirmed discoveries
Source Page: Extrasolar planet

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