There is no "twelfth planet" from the sun. Our solar system currently has eight officially recognized planets:

1. Mercury

2. Venus

3. Earth

4. Mars

5. Jupiter

6. Saturn

7. Uranus

8. Neptune

Pluto, which was once considered the ninth planet, was reclassified as a dwarf planet in 2006.

There have been theories and claims about a "Planet Nine" or "Planet X" existing beyond Neptune, but these are currently unproven.