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Sources:
https://www.chemistryworld.com/news/controversial-metallic-hydrogen-claim-under-new-scrutiny-/2500534.article
https://www.chemistryworld.com/news/has-metallic-hydrogen-been-discovered/2500516.article
https://www.missionjuno.swri.edu/jupiter/the-interior?show=hs_jupiter_the-interior_story_a-dive-into-jupiter
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.116.255501
http://www.ph.ed.ac.uk/news/2016/probing-dark-hydrogen-giant-planets-16-06-23
http://www.csec.ed.ac.uk/research-highlights/squeezing-oil-and-water-until-they-mix
http://advances.sciencemag.org/content/advances/3/8/e1700240.full.pdf
https://carnegiescience.edu/news/metal-insulator-and-back-again
https://www.chemistryworld.com/news/metals-lose-identity-under-pressure-/3002474.article
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.114.156403
http://www.nature.com/nature/journal/v458/n7235/abs/nature07827.html?
http://hyperphysics.phy-astr.gsu.edu/hbase/Solids/band.html
https://www.aocs.org/stay-informed/read-inform/featured-articles/emulsions-making-oil-and-water-mix-april-2014
http://www1.lsbu.ac.uk/water/supercritical_water.html
https://www.space.com/35606-helium-compounds-giant-planet-interiors.html
https://arxiv.org/pdf/1309.3827.pdf
https://www.sciencenews.org/article/heliums-inertness-defied-high-pressure-compound
https://www.forbes.com/sites/carmendrahl/2017/02/07/helium-sodium-compound-pressure/
http://pubs.acs.org/doi/abs/10.1021/ja00877a042
https://www.scientificamerican.com/article/saturn-s-core-might-be-cloaked-in-a-neon-shield/
http://www.pnas.org/content/112/26/7925.full.pdf

https://www.nature.com/articles/srep34896
http://www.nature.com/nature/journal/v406/n6798/abs/406874a0.html
https://solarsystem.nasa.gov/galleries/juno-how-do-jupiter-and-earth-compare

Images:
https://commons.wikimedia.org/wiki/File:Diamond_Anvil_Cell_-_Cross_Section.svg
https://commons.wikimedia.org/wiki/File:Methane-CRC-MW-3D-balls.png
https://commons.wikimedia.org/wiki/File:Titan_multi_spectral_overlay.jpg
https://commons.wikimedia.org/wiki/File:Triton_moon_mosaic_Voyager_2_(large).jpg
https://en.wikipedia.org/wiki/File:Jupiter_and_its_shrunken_Great_Red_Spot.jpg