The first extra-solar planet (in other words, circling a star and not our sun) was discovered in 1995.
THIS PLANET IS THE FIRST TO BE DISCOVERED BY MATH THIS PLANET IS THE FIRST TO BE DISCOVERED BY MATH
Uranus was the first planet to be discovered in 1781.
Uranus was the first planet to be discovered in 1781.
the planet Saturn
Saturn was the first planet discovered to have rings.
The planet, Uranus.
First of all, Callisto is too small to become a planet, and secondly it rotates around another planet (Jupiter) not around the sun directly.
Earth...
NOPE!
Oxygen was discovered by the very first species on planet Earth.
It was discovered by William Herschel on March 13, 1781 and was the first planet discovered in modern times. It is also the first planet discovered with a telescope as opposed to the naked eye.
No planets have been discovered using a microscope.