# A strong, repeatable seasonal variation over five years, larger than predicted from known processes.

> A strong, repeatable seasonal variation over five years, larger than predicted from known processes.

Source: https://mysteriesdept.com/mysteries/mars-methane/evidence/EVD0D7EY2BA435M/a-strong-repeatable-seasonal-variation-over-five-years  
Publisher: Mysteries Department  
Licence: CC BY 4.0 (credit Mysteries Department and link the page)  

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[Mars methane puzzle](https://mysteriesdept.com/mysteries/mars-methane)Evidence

Evidence · Mars methane puzzle

# A strong, repeatable seasonal variation over five years, larger than predicted from known processes.

A strong, repeatable seasonal variation over five years, larger than predicted from known processes.

Suggestive0

## What it bears on 1 answer

[Background methane varies seasonally from about 0.24 to 0.65 ppbv.](https://mysteriesdept.com/mysteries/mars-methane/answers/ANS0D7EY23G5D79/background-methane-varies-seasonally-from-about-0-24-to-0-65)

Disputed

FOR

## Cite it

```
Mysteries Department. (2026). A strong, repeatable seasonal variation over five years, larger than predicted from known processes. [Evidence EVD0D7EY2BA435M]. https://mysteriesdept.com/r/EVD0D7EY2BA435M
```

Key

**EVD** 0D7EY2BA435M

Kind

Evidence

Tier

Suggestive

Version

1

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