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美国天文学家们在测量天空中最亮的类星体3C 273星系的光谱时，发现这个遥远的星系中间有一团奇怪的致密气体云。在随后的测量中，再次发现了这团气体云中有些化学元素，竟然是超新星爆炸时才能产生的重元素。可匪夷所思的是那附近根本没有能提供这些气体与重元素的其它天体。?
Astronomers in the United States measured the spectrum of the brightest quasar in the sky, the 3C 273 galaxy, and found a strange cloud of dense gas in the middle of this distant galaxy. In the subsequent measurements, the chemical elements in the gas cloud were discovered again, and turned out to be heavy elements that could be produced when the supernova exploded. What is incredible is that there are no other objects in the vicinity that can provide these gases and heavy elements. ?