英语阅读：黑洞.doc

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黑洞
What is a black hole? Well, it's difficult to answer this question, since the terms we would normally use to describe a scientific phenomenon are inadequate here. Astronomers and scientists think that a black hole is a region of space (not a thing) into which matter has fallen and from which nothing can escape - not even light. So we can't see a black hole. A black hole exerts a strong gravitational pull and yet it has no matter. It is only space - or so we think. How can this happen?
什么是黑洞呢?这个问题很难回答,因为我们通常用来描述一种科学现象的术语用在这里来解释是不够的。天文学家和科学家们认为黑洞是个空间区域,物体会掉进去,而没有物体能从中逃逸出来――即使是光也不能,所以我们看不到黑洞。黑洞产生很强的引力,而它却没有物质。它只是空间――或者我们认为是空间。这是怎样发生的呢?
The theory is that some stars explode when their density increases to a particular point; they collapse and sometimes a supernova occurs. From earth, a supernova looks like a very bright light in the sky which shines even in the daytime. Supernovae were reported by astronomers in the seventeenth and eighteenth centuries. Some people think that the Star of Bethlehem could have been a supernova. The collapse of a star may produce a White Dwarf or neutron star - a star, whose matter is so dense that it continually shrinks by the force of its own gravity. But if the star is very large (much bigger than our sun) this process of shrinking may be so intense that a black hole results. I