# 03

据说一切都是由点构成的。那么可以把地球看做是一个点。除了炽热的太阳之光，远处都是或明或暗的星河。这么算来，人类还真是渺小。就算跟地球相比，也不过是沙滩上的一粒沙。 即便这样，学习带来的视野远超于此。地球在太阳系内。太阳系又在银河星系之内。太阳系距离银河星系的中心有26,000光年之远。而银河星系在本星系群内，这个星系群大约有50个这么大的星系。本星系群是室女座超星系团的一部分。旅行者一号已经就算是飞出了太阳系，人类已经探索了大约200亿光年的宇宙。从这点看来，即使是小到看不见，也可以知晓不知道多远，不知道多久之前的事物呢。 早安，世界。早安，未来。早安，学习的你。

<figure><img src="/files/6ONnOnACfCd1vrQbRKeG" alt=""><figcaption></figcaption></figure>


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://www.oulan.com/2018/04/03.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.