Laboratory work on a mixture of icy materials at very high pressures (around 2 10 6

Question:

Laboratory work on a mixture of icy materials at very high pressures (around 2 × 10⁶ bar = 2 Mbar) has led to a suggestion that Uranus and Neptune do not have rocky cores at all but are composed entirely of icy materials plus hydrogen and helium. Does such a suggestion conflict with the observational evidence?

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