The first two planets discovered were Earth and Mars.
Another Answer:
The first two planets, with respect to the Sun, are Mercury and Venus.
In our solar system, Mercury and Venus are the two planets which do not have moons.
Mercury Venus Earth and Mars are all the inner planets.
The first four planets closest to the Sun are the four terrestial planets.
Yes, the first four planets in our solar system are rocky planets. They are Mercury, Venus, Earth, and Mars. These planets have solid surfaces made mostly of rock and metal.
The inner two terrestrial planets are Mercury and Venus.
Jupiter and Saturn are the largest planets in our solar system.
Two of them are the third of gas planets and the first discovered in modern times
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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.
Neptune and Pluto
In Planetary Science the two largest planets are Jupiter and Saturn.
The first five planets in the order from closest to farthest are Mercury, Venus, Earth, Mars, and Jupiter. The first four planets are inner planets, and Jupiter is an outer planet.