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Sources:
https://www.space.com/31414-mars-methane-mystery-life-signs.html
http://nautil.us/blog/theres-mysteriously-large-amounts-of-methane-on-mars
https://www.space.com/17048-water-on-mars.html
http://www.latimes.com/science/sciencenow/la-sci-sn-dry-ice-carbon-dioxide-water-gullies-mars-20151221-story.html
https://phys.org/news/2011-12-gas-formed-gullies-norm-mars.html
http://sciworthy.com/what-could-have-created-the-ancient-martian-rivers/
https://www.nasa.gov/press/2015/march/nasa-research-suggests-mars-once-had-more-water-than-earth-s-arctic-ocean
http://www.techtimes.com/articles/29850/20150131/why-mars-two-hemispheres-are-drastically-different.htm
https://www.universetoday.com/15262/two-faces-of-mars-explained/
http://www.futurity.org/mars-hemispheres-846802/
https://phys.org/news/2014-06-lava-canyons-mars.html
http://news.nationalgeographic.com/news/2004/10/1007_041007_mars_methane_2.html
http://www.planetary.org/blogs/guest-blogs/2016/0804-gullies-on-mars-wet-or-dry-ice.html
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Images:
https://mars.nasa.gov/multimedia/images/?ImageID=6453
https://mars.nasa.gov/multimedia/images/?ImageID=5396
https://mars.nasa.gov/mer/gallery/press/opportunity/20120117a/PIA15277_3rovers-hi_D2011_1215_D511.jpg
https://www.nasa.gov/sites/default/files/images/585497main_PIA09703_full.jpg
https://www.nasa.gov/sites/default/files/images/462129main_PIA13186_full.jpg
https://www.nasa.gov/sites/default/files/hrp-curiosity-rad-pia16239.jpg
https://www.nasa.gov/sites/default/files/thumbnails/image/pia00271.jpg
https://www.nasa.gov/sites/default/files/thumbnails/image/pia18538.jpg
https://apod.nasa.gov/apod/image/0502/chasma_marsExpress_f50.jpg
https://www.nasa.gov/sites/default/files/thumbnails/image/esp_040811_2410.jpg
https://www.nasa.gov/image-feature/enhanced-color-panorama-above-perseverance-valley-on-mars
https://www.jpl.nasa.gov/spaceimages/details.php?id=PIA20379
https://www.nasa.gov/multimedia/imagegallery/image_feature_1177.html
We’ve learned a lot about Mars over the years, but we keep uncovering new mysteries — important, fundamental aspects of The Red Planet that we just can’t explain. Here are three of them.