ESA has released new Mars Express images that catch Mars in the act of changing colour, as a dark tide of volcanic ash creeps across the planet’s bright northern plains. ESA (European Space Agency) has released new Mars Express images that catch Mars in the act of changing colour, as a dark tide of volcanic ash creeps across the planet’s bright northern plains. A 50‑Year “Before and After” of Mars The star of the rel... [1945 chars]