It is impossible to walk on any planet in our solar system except for Earth. This is because the surfaces of other planets are either too hot or too cold, have no solid ground to walk on, or have atmospheres that are either too thin or too dense for humans to survive without a spacesuit.
For example, Venus has a thick, toxic atmosphere that would crush and suffocate a human, and its surface temperature is hot enough to melt lead. Mars has a thin atmosphere that lacks sufficient oxygen, and its surface is covered in fine dust that makes it difficult to walk without specialized equipment.
Jupiter, Saturn, Uranus, and Neptune are gas giants with no solid surfaces, only layers of gas and liquid. Their atmospheres are extremely hostile to humans, with strong winds, extreme temperatures, and high levels of radiation.
Therefore, while it may be possible to explore some of these planets using specialized equipment and technology, walking on their surfaces is not possible for humans.
