The strange weather was found in the 1st detailed study of the exoplanet's 'dark side.'
This hot Jupiter is tidally locked, meaning it has one side that is always facing its star and another side that faces away. On WASP-121 b's star-facing dayside, metals and minerals evaporate. The dayside's upper atmosphere can get as hot as about 5,400 degrees Fahrenheit , so hot that water in the atmosphere glows and molecules break down, according to a statement.
The temperatures on the nightside are never low enough for water clouds to form during this cycle, but that doesn't mean that clouds don't form at all. While water clouds don't form, metal clouds do. But metal clouds aren't the only strange phenomenon these researchers spotted on this hot Jupiter. They also found evidence of possible rain in the form of liquid gems.
This metal vapor condensed into metallic rain would see aluminum condense together with oxygen, forming corundum. This is a metallic compound that, when tainted by other metals suspected in the planet's atmosphere, would form what we know on Earth as rubies or sapphires, according to the statement.
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