FONTE NASA: https://www.nasa.gov/image-feature/martian-morse-code
GIZMODO: http://gizmodo.com/theres-a-secret-message-written-into-the-sands-of-mars-1783330309?utm_campaign=socialflow_io9_facebook&utm_source=io9_facebook&utm_medium=socialflow
FONTE NASA: https://www.nasa.gov/image-feature/martian-morse-code
GIZMODO: http://gizmodo.com/theres-a-secret-message-written-into-the-sands-of-mars-1783330309?utm_campaign=socialflow_io9_facebook&utm_source=io9_facebook&utm_medium=socialflow