Mysterious Picture crowd of giant spiders on Mars, what's that?
The European Space Agency's (ESA) ExoMars Trace Gas Orbiter satellite has discovered a strange structure they call the "martian spider mark".
![](https://kbin.social/media/cache/resolve/entry_thumb/2c/fb/2cfbccfe5c3b149171d7b2bc4fe2e44908f4bd20f21c18a77200bad48801b0d7.png)
The European Space Agency's (ESA) ExoMars Trace Gas Orbiter satellite has discovered a strange structure they call the "martian spider mark".