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Two Planets was created in 1897.
The two planets with overlapping orbits are Neptune and Pluto. These are the only two planets that have overlapping orbits.
Mercury and Uranus are the two planets that are farthest apart.
The other two planets are Mercury and Venus.
The first two planets discovered were Earth and Mars.
Another Answer:
The first two planets, with respect to the Sun, are Mercury and Venus.