at Lawrence Livermore National Laboratory used high-powered lasers to put molten magnesium silicate under extreme pressure. They found out that that it goes through a liquid state phase change by suddenly becoming a denser liquid as pressure increases.
It also suggests that so called supper Earths could have significantly different internal structures from that of the Earth. The result of is that these called supper Earths could be significantly denser than previously thought. Meaning that they would be smaller in diameter, giving them a higher surface gravity making them even less hospitable to life,