Neptune and Pluto
Neptune was added to the eight planets on September 23, 1846 by Johann Gottfried Galle, of the Berlin Observatory
Two Planets was created in 1897.
The other two planets are Mercury and Venus.
Two types of planets are terrestrial planets, which are small, rocky planets like Earth, and gas giant planets, which are large planets primarily composed of hydrogen and helium, such as Jupiter and Saturn.
Mercury and Venus are the two planets that have no moons.
A Dweller on Two Planets was created in 1905.
In our solar system, Mercury and Venus are the two planets which do not have moons.
In Planetary Science the two largest planets are Jupiter and Saturn.
Mercury Venus Earth and Mars are all the inner planets.
The inner two terrestrial planets are Mercury and Venus.
Only two. Mercury and Venus. They are the two closest planets to the Sun.
Mars has two moons, not planets, named Phobos and Deimos.