In school we are taught that in order for life to exist, respiration must occur: that is, the taking of sugars like glucose and combining it with oxygen to give you carbon dioxide, water, and a small amount of energy. This energy is used to fuel metabolic processes in all life forms – boiling down to the ability to survive and reproduce. But there are exceptions, such as the many types of “electric bacteria” that use energy in the form of electricity.
There is an abundance of evidence, provided to us by NASA’s many missions, that there is water on Mars. Most of this is ice water, but there are tiny amounts in the Martian atmosphere and recently there has even been evidence that liquid water is found on the surface. But how did we come to know this, and what is the significance?