PSR B1257+12 ka onye Polish astronomer Aleksander Wolszczan chọpụtara na 9 February 1990 site na iji redio telescope Arecibo. Ọ bụ a millisecond pulsar, a ụdị neutron kpakpando, na a rotation oge nke 6.22 milliseconds (9,650 rpm), na a chọpụtara na-enwe anomalies na pulsation oge, nke dugara nnyocha dị ka ihe na-akpata na-adịghị edozi edozi pulses. Na 1992 Wolszczan na Dale Frail bipụtara a ma ama akwụkwọ na mbụ enen chọpụtara nke mbara ala n'èzí anyị anyanwụ usoro. Iji nụchara anụcha usoro ọzọ otu mbara ala a hụrụ na-agba gburugburu a pulsar na 1994. Ajụjụ: Ònye chọpụtara BPSR1257+12?
Aleksander Wolszczan