# SAO/NASA Astrophysics Data System

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Since: 3.7
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[SAO/NASA Astrophysics Data System](http://www.adsabs.harvard.edu/) is an online database of over eight million astronomy and physics papers from both peer reviewed and non-peer reviewed sources. Abstracts are available free online for almost all articles, and full scanned articles are available in Graphics Interchange Format (GIF) and Portable Document Format (PDF) for older articles ([Wikipedia](https://en.wikipedia.org/wiki/Astrophysics_Data_System)).

To fetch entries from SAO/NASA Astrophysics Data System, choose **Search → Web search**, and the search interface will appear in the side pane. Select **SAO/NASA Astrophysics Data System** in the dropdown menu. To start a search, enter the words of your query, and press Enter or the **Fetch** button.

Then, the results are displayed in the [import inspection window](/v4/import-export.md). In case an error occurs, it is shown in a popup.

Apart from fetching entries by using a full search, it is also possible to directly create a BibTeX entry using the **BibTeX → New Entry** dialog. More details are described at [ADS-to-BibTeX](/v4/finding-sorting-and-cleaning-entries/import-using-publication-identifiers/adstobibtex.md).


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# 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://docs.jabref.org/v4/finding-sorting-and-cleaning-entries/import-using-online-bibliographic-database/ads.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.