Rather, a strange chemical reaction recently captured by European Space Agency probes is to blame for the spider-like feature ...

In something straight out of an episode of Doctor Who, a Mars orbiter has spotted what appears to be a swarm of spiders ...

These eruptions sometimes leave dusty, jagged streaks, nicknamed "spiders on Mars." Related: Hundreds of black 'spiders' spotted in mysterious 'Inca City' on Mars in new satellite photos Mars has four ...