# Background methane varies seasonally from about 0.24 to 0.65 ppbv.

> Disputed: Background methane varies seasonally from about 0.24 to 0.65 ppbv.

Source: https://mysteriesdept.com/mysteries/mars-methane/answers/ANS0D7EY23G5D79/background-methane-varies-seasonally-from-about-0-24-to-0-65  
Publisher: Mysteries Department  
Licence: CC BY 4.0 (credit Mysteries Department and link the page)  

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[Questions](https://mysteriesdept.com/questions)[Mars methane puzzle](https://mysteriesdept.com/mysteries/mars-methane)[Does the background follow a seasonal cycle?](https://mysteriesdept.com/mysteries/mars-methane/questions/QST0D7EXX785WEM/does-the-background-follow-a-seasonal-cycle)Answer

Answer · Mars methane puzzle

# Background methane varies seasonally from about 0.24 to 0.65 ppbv.

Background methane varies seasonally from about 0.24 to 0.65 ppbv.

**Disputed** Answers **1** questionPublished0

## Where it stands

**Disputed** One piece of evidence for, none against. It needs two reviews to be accepted.

## What it predicts

- The cycle repeats in later Mars years.

## What would rule it out

- Later years' data inconsistent with the same phase and amplitude.

## Evidence 1 for · none against

[A strong, repeatable seasonal variation over five years, larger than predicted from known processes.](https://mysteriesdept.com/mysteries/mars-methane/evidence/EVD0D7EY2BA435M/a-strong-repeatable-seasonal-variation-over-five-years)

Suggestive

FOR

## The questions it answers

[Does the background follow a seasonal cycle?](https://mysteriesdept.com/mysteries/mars-methane/questions/QST0D7EXX785WEM/does-the-background-follow-a-seasonal-cycle)

Part of [Is there methane in the air at Gale crater?](https://mysteriesdept.com/mysteries/mars-methane/questions/QST0D7EXWQM6TWB/is-there-methane-in-the-air-at-gale-crater)

Open3 answers, none ahead

## Cite it

```
Mysteries Department. (2026). Background methane varies seasonally from about 0.24 to 0.65 ppbv. [Answer ANS0D7EY23G5D79]. https://mysteriesdept.com/r/ANS0D7EY23G5D79
```

Key

**ANS** 0D7EY23G5D79

Kind

Answer · hypothesis

Origin

Published

Version

1

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