ELI5: Explain Like I'm 5

Groundwater on Mars

Groundwater on Mars is water that exists beneath the surface of the planet Mars. Mars is a rocky planet that is much colder and drier than Earth. The atmosphere of Mars is much thinner than Earth's, which means that water cannot exist as a liquid on the surface of the planet. However, there is strong evidence that Mars once had rivers, streams, and oceans on its surface. Scientists believe that some of this water is still present on Mars in the form of ice and groundwater.

Groundwater is water that is located beneath the surface of the planet. On Earth, groundwater is an important source of water for drinking, agriculture, and other purposes. Mars has a similar system of groundwater, although it is much different than on Earth.

The groundwater on Mars is thought to exist in aquifers, which are layers of porous rock that allow water to seep through. These aquifers may be located several kilometers beneath the surface of Mars. Scientists have discovered evidence of these aquifers by studying the geology of Mars and using data from satellites and rovers.

One of the most important discoveries related to groundwater on Mars was made by the Mars Reconnaissance Orbiter (MRO). The MRO detected what appears to be subsurface lakes of liquid water beneath the surface of Mars. These lakes, which are located near the planet's south pole, are thought to be kept in a liquid state by dissolved salts in the water. This discovery is important because it suggests that Mars may be able to support microbial life, and it also opens up the possibility of extracting water from Mars for use by humans.

In summary, groundwater on Mars is water that exists beneath the surface of the planet. It is thought to exist in aquifers located several kilometers beneath the surface of Mars. Scientists have discovered evidence of these aquifers by studying the geology of Mars and using data from satellites and rovers. The recent discovery of subsurface lakes of liquid water on Mars is particularly important, as it suggests that Mars may be able to support microbial life and potential future human habitation.