It helps the writers visualize the inside of a black hole.
The other options can described bluntly and scientifically with just names and numbers.
If the writer were to use more formal writing to describe things so abstract like a black hole, it would be hard for the common reader to understand.
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for example,
The black hole looks like a giant vacuum of nothingness (informal)
The black hole is like a mass whose Schwarzchild radius is outside of itself (formal)
Which is easier to understand? Most likely the first one because of the use of informal language and writing.
Hope I helped!
