Hycean is a portmanteau of ocean and hydrogen.
https://en.wikipedia.org/wiki/Hycean_planet
The astronomers just invented it back in August of this year.
Spoiler: They are worlds in intermediate stages of evolution between Neptune like worlds and Ocean worlds, as predicted to exist by stellar metamorphosis.
Book here: https://vixra.org/abs/1711.0206
Unidentified flying objects... they don't fly, doesn't fit.
Unidentified aerial phenomenon? Some were observed in the ocean and outer space, doesn't fit.
Unidentified aerial and transmedium craft? Sure.
They are unidentified, aerial, transmedium and... they are craft. Clearly.
https://cosmosmagazine.com/space/astronomy/did-venus-ever-have-oceans/
More mainstream uggghhhhh concerning Venus never having had oceans.
Venus is ~450-750 billion years old.
Lets do the math here. How accurate are the weatherman's take on hurricanes? Spaghetti models anybody?
Yet they know the entire past history of a dead star based on current conditions? Come on.
For those who what a more comprehensive understanding of stars, watch this video:
Funny. A google search doesn't turn up facts like that. It takes hundreds of millions of years to form an exoplanet.
All exoplanets are old.
