Read this excerpt from A Black Hole is NOT a Hole.
In outer space, mysterious entities called black holes seem up to no good.
From the headlines, you'd think black holes were beasts with endless appetites, lying in wait for the next meal. By some reports they are "runaway," out-of-control "predators" that "feed" on galaxies, only to "belch" and "spit out" what they don't eat. They "lurk" in the shadows, "mangling" stars and "gobbling" them up. In short, they have a nasty reputation for being monsters "gone mad."
In this introduction, the author makes it clear that she is writing for
scientists because she uses scientific terms.
children because she uses language children understand.
teachers because she uses educational instructions.
astronauts because she uses technical language.