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1974年,天文学家观测到一颗新的脉冲星。它位于天鹰星座,距地球1.5万光年。它的名字:1923+16。现在,这颗脉冲星每秒发出17次无线电信号,有规律地到达地球。由此,脉冲星的信号就像一台稍不精确的天文钟。有时它微弱地变慢,有时又微弱地变快。但是这种变化是可以察觉的,并可由波多黎各的一个直径为300米的无线电天线检测出来。通过对信号变化详细的分析,科学家们推测脉冲星由两个中子星组成。信号的变化使科学家们能够看见轨迹。于是天文学家可以“用耳朵看”了。
In 1974, astronomers observed a new pulsar. It is located in Eagle Constellation, 15,000 light years from the Earth. Its name: 1923 +16. Now, the pulsar emits 17 radio signals a second and arrives regularly on Earth. As a result, the pulsar's signal is like a slightly inaccurate chronometer. Sometimes it faintly slows, sometimes faintly faster. But the change is detectable and detected by a 300-meter radio antenna in Puerto Rico. By analyzing the signal changes in detail, scientists speculate that the pulsar consists of two neutron stars. The signal changes allow scientists to see the trajectory. So astronomers can “see” their ears.