Here you go! https://books.google.com/books?id=RaJdy3_VINQC&pg=PA224&lpg=PA224&dq=planet+neptune+heat+flow&redir_esc=y#v=onepage&q=planet%20neptune%20heat%20fl

Here you go! https://books.google.com/books?id=RaJdy3_VINQC&pg=PA224&lpg=PA224&dq=planet+neptune+heat+flow&redir_esc=y#v=onepage&q=planet%20neptune%20heat%20flow&f=false https://books.google.com/books?id=RaJdy3_VINQC&pg=PA224&lpg=... https://iopscience.iop.org/article/10.1088/0004-637X/789/1/69 https://iopscience.iop.org/article/10.1088/0004-637X/789/1/6... http://www.psrd.hawaii.edu/Aug01/bombardment.html http://www.psrd.hawaii.edu/Aug01/bombardment.html For me the anomaly is the heat of these planets, and the physical processes this suggests. I suspect that our current explanations are only partial and that a great discovery lies somewhere here.