Ununoctium
wind
The latest confirmed element discovered was Livermorium, 116Lv, in 2000. Ununseptium is not officially credited as "discovered" by the IUPAC/IUPAP Joint Working Party, but it is the most recently synthesized element, made in 2010.
Antarctica is the most recently discovered continent.
water was recently discovered on planet mars
Neptune was discovered on September 23rd, 1846.
The most recently discovered country is Bougainville, a region of Papua New Guinea that gained independence in 2020.
buckyballs, buckytubes or nanotubes are the recently discovered forms of carbon from 1950s.
pulsar and quasars
Intro-cirrus...the most recently discovered cloud type is, of course, the rarest!
plants
I don't know what you mean by "recently". It was discovered in the 1500's by the Spaniards.