“脉冲星”的英语？

某些脉冲星发送脉冲比地球上最精确的时钟都准时。Some pulsars keep time better than the earth's most accurate clocks.他们发现了以往想象不到的新客体 —— 脉冲星 、 类星体和黑洞.They have discovered now , previou sly unimagined objects - pulsars, quasars, and black hole...