{"id":787256,"date":"2024-08-13T20:35:52","date_gmt":"2024-08-14T01:35:52","guid":{"rendered":"http:\/\/spaceweekly.com\/?p=787256"},"modified":"2024-08-13T20:35:52","modified_gmt":"2024-08-14T01:35:52","slug":"we-keep-finding-water-on-mars-here-are-all-the-places-it-might-be","status":"publish","type":"post","link":"https:\/\/spaceweekly.com\/?p=787256","title":{"rendered":"We keep finding water on Mars \u2013 here are all the places it might be"},"content":{"rendered":"
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Martian water may be lurking beneath \u2013 or even above \u2013 the planet\u2019s surface<\/p>\n
Mars is not as arid as it may seem. Billions of years ago, the surface of the Red Planet rippled with oceans and rivers of liquid water, but now it seems that all of that fluid has disappeared, leaving behind a dusty wasteland. However, as we have explored the planet with orbiters, landers, rovers and even telescope images from afar, traces of water keep popping up.<\/p>\n
Each hint tantalises researchers because of how crucial water is for living organisms and how helpful it could be for future exploration. Water has now been discovered all over Mars, in many different forms \u2013 here are five places it has been spotted.<\/p>\n
1. Buried underground<\/h2>\n\n
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The InSight lander, visualised here, recently found another potential water reservoir on Mars<\/p>\n
Just beneath Mars\u2019s parched surface lies a wonderland of water ice. These deposits are kept insulated by the layers of dust on top of them, but erosion and meteorite impacts can expose them to the prying eyes of our orbiters. A single ice deposit recently identified using data from the Mars Express orbiter seems to contain enough water to cover the entire surface of Mars in an ocean 1.5 to 2.7 metres deep.<\/p>\n
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It\u2019s not just ice buried under the shifting orange sands. Hints of a huge lake beneath the planet\u2019s south pole have been controversial \u2013 it may simply be wet silt or volcanic rock. But a new study using data from the InSight lander has revealed another possible reservoir of water near the planet\u2019s equator. InSight found this water buried 11.5\u00a0to 20 kilometres underground by feeling for marsquakes and measuring how fast those seismic waves travelled, which revealed that the rocks those quakes were propagating through seemed to be saturated with water.<\/p>\n
2. Frosting over the poles<\/h2>\n\n
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Frost in a crater on Mars\u2019s Northern Plains<\/p>\n
NASA\/JPL-Caltech\/Univ. of Arizona<\/p>\n<\/div>\n<\/figcaption><\/figure>\n<\/p>\n
Getting at the buried water\u00a0on Mars would be difficult, so perhaps a more promising reservoir for future explorers is bared right on the surface. The poles on Mars have ice caps just like on Earth, and we have known about them for decades. Many craters on Mars also have smaller ice sheets inside them. These are the only places on Mars\u2019s\u00a0surface that stay cold enough for ice to stick around.<\/p>\n
However, there is also some transient frost that forms at high latitudes on Mars, where the air tends to be colder and more humid. On some frigid Martian mornings, volcanic peaks frost over as well, which is probably due to water vapour freezing out of the atmosphere.<\/p>\n
3. Floating in the atmosphere<\/h2>\n\n
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Mars\u2019s atmosphere may hold hints of travelling water<\/p>\n
Because of the bitter cold and tenuous\u00a0atmosphere on Mars, any liquid water on the surface would sublimate away, turning directly into gas and floating up into the air. Water vapour in the atmosphere is a sign of water and ice migrating across the planet\u2019s surface to form frost, but it is only present in minuscule amounts. Occasionally, there is enough water vapour in one area to generate a few wispy clouds, but for the most part it is nearly negligible.<\/p>\n
4. Running downhill<\/h2>\n\n
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Dark, narrow streaks on Martian slopes like these at Hale Crater may be formed by seasonal water flow<\/p>\n
NASA\/JPL-Caltech\/Univ. of Arizona<\/p>\n<\/div>\n<\/figcaption><\/figure>\n<\/p>\n
Perhaps the most controversial of the possible signs of water on Mars are recurring slope lineae, which are dark streaks that sporadically appear running down the sloped edges of craters. They were first discovered in 2011, and since then there has been lively debate among researchers about what causes them. They occur primarily in the warmest parts of the year, so they could be caused by ice melting and then running downhill before evaporating away \u2013 which would make them the only liquid water ever spotted on the surface of Mars. Or, they could be simple sand flows. Over time, the latter hypothesis has gained support, but some researchers hold out hope that there could be a trickle of liquid water on the Red Planet.<\/p>\n
5. Trapped in rocks<\/h2>\n\n
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The Red Planet\u2019s rocks may have sucked up its water<\/p>\n
NASA\/JPL-Caltech\/Univ. of Arizona<\/p>\n<\/div>\n<\/figcaption><\/figure>\n<\/p>\n
If Mars used to be covered in water, and now all that\u2019s left is a bit of ice and a whole lot of dust and stone, where did all that water go? One possible solution is that it got slurped up into the rocks themselves. Mars rovers have found no shortage of minerals with water molecules incorporated into their chemical structures all over the planet.<\/p>\n
This process is irreversible, so there is no way for us to get all that water back \u2013 but accounting for where all the water went is crucial to understanding what Mars was like before it dried out. That may be our best chance for understanding if Mars ever really was hospitable to life.<\/p>\n\n
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