# Arecibo drift scans found narrowband hydrogen-line signals from small cold clouds, about a hundred times…

> Arecibo drift scans found narrowband hydrogen-line signals from small cold clouds, about a hundred times weaker than Wow!, in several fields.

Source: https://mysteriesdept.com/mysteries/wow-signal/evidence/EVD0CXZ4SS641MV/arecibo-drift-scans-found-narrowband-hydrogen-line-signals  
Publisher: Mysteries Department  
Licence: CC BY 4.0 (credit Mysteries Department and link the page)  

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Evidence · Wow! signal

# Arecibo drift scans found narrowband hydrogen-line signals from small cold clouds, about a hundred times…

Arecibo drift scans found narrowband hydrogen-line signals from small cold clouds, about a hundred times weaker than Wow!, in several fields.

Supported0

## What it bears on 1 answer

[A sudden maser-like or superradiant brightening of a small cold interstellar hydrogen cloud, triggered by a…](https://mysteriesdept.com/mysteries/wow-signal/answers/ANS0CXZ4SHC7DZM/a-sudden-maser-like-or-superradiant-brightening-of-a-small)

Still possible

FOR

## Cite it

```
Mysteries Department. (2026). Arecibo drift scans found narrowband hydrogen-line signals from small cold clouds, about a hundred times… [Evidence EVD0CXZ4SS641MV]. https://mysteriesdept.com/r/EVD0CXZ4SS641MV
```

Key

**EVD** 0CXZ4SS641MV

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Evidence

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Supported

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1

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