This is a painful question from a teacher who is trying to get into trouble. Don’t harm the flowers of the motherland.
For this type of question, just look at it and throw it away, don’t bother thinking about it.
Think about what an idiom is? Idioms (chengyu, idioms) are part of the stereotyped phrases or short sentences in the Chinese vocabulary of Chinese language. Idioms have fixed structural forms and fixed sayings, express certain meanings, and are used as a whole in sentences. A large part of idioms are inherited from ancient times, and their wording is often different from modern Chinese. They represent a story or allusion. Idioms are also ready-made words, similar to customary expressions and proverbs, but also slightly different. Most idioms come from writing and are of a literary nature. Secondly, in terms of language form, idioms are almost all conventional four-character structures, and the words cannot be changed at will; idioms play a vivid, concise and vivid role in language expression.
Telescopes and cars are all modern things. According to the definition of "idiom", the description of these cannot be regarded as idioms. It should be classified as a modern word or colloquial saying. Since cars entered China, almost no new idioms have been born, but there are quite a few describing horse-drawn carriages. Such as busy traffic, cars coming and going, blocked water, endless stream, endless flow, cars and horses like dragons, cars and horses filling the door, cars carrying buckets, even cars sharing the same bucket, etc., but these have nothing to do with telescopes. I'm afraid even the teacher who asked the question couldn't answer this idiom himself, so he could only make assumptions about it.
The teacher who asked the question couldn't even figure out the definition of the idiom, so why bother with it?