PSR B1257+12 waxaa lagu ogaadey 9 Febraayo 1990 kii by astronomer Polish Aleksander Wolszczan oo isticmaalaya raadiyo telescope Arecibo. Waa milisecond pulsar, nooc ka mid ah xiddigaha neutron, oo leh xilli wareeg ah 6.22 milliseconds (9,650 rpm), waxaana la ogaadey in ay leeyihiin qaladaad ku jira muddada garaaca, taas oo keentay baaritaano ku saabsan sababta garaaca aan caadiga ahayn. 1992kii Wolszczan iyo Dale Frail waxay daabaceen warqad caan ah oo ku saabsan ogaanshaha ugu horreeya ee la xaqiijiyay ee meerayaasha ka baxsan nidaamkayaga qorraxda.
Aleksander Wolszczan wuxuu ahaa