Uranus and Neptune.
The largest unknown planet in our solar system is currently referred to as Planet Nine or Planet X. It is thought to be a large planet located beyond Pluto's orbit, but it has not been directly observed yet.
The planet closest to the Sun, the smallest planet, the second densest planet, it is similar in appearance to the moon, Mercury orbits around the Sun faster than any other planet, it has no moons, Mercury has no atmosphere, It was known as Apollo and Hermes in ancient times, it is highly visible just after sunset, it is also known as the swift planet.
The planet Mercury was first discovered by ancient civilizations, so there is no single individual credited with its discovery. It has been observed since ancient times due to its brightness and proximity to the Sun.
It is not definitively known whether the unknown planet has a liquid region in its interior without further exploration and analysis. The presence of a liquid region could depend on factors such as the planet's composition, temperature, and geological activity.
Mars was named by the ancient Romans after their god of war, due to its reddish color resembling blood. The name has been used since ancient times to refer to the planet in various cultures.
It is unknown
Neptune the planet was unknown to the ancient Greeks. It was discoveered in 1846.
Unknown. Leprosy goes back to ancient times.
it was named after a Greek God in ancient times
This is impossible to answer for a planet with unknown conditions or characteristics.
unknown. Silver has been used for over hundreds and millions of times (ancient times) basically no one figured out who.
Fireworks existed in China since ancient times, the date is unknown
'Ancient Astronaut' theorists believe that it is quite possible that the Inca -as a race- exited this planet for another, and still exist... elsewhere; unknown.
Jupiter has always been a planet. It has been known about since ancient times, and is classified as one of the gas giants.
The largest unknown planet in our solar system is currently referred to as Planet Nine or Planet X. It is thought to be a large planet located beyond Pluto's orbit, but it has not been directly observed yet.
planet x is unknown but is farther than Pluto
The simple pulley was invented in ancient times by an unknown person. The compound pulley was invented by Archimedes.