Probably. Nobody has ever walked on another planet before, but plans to put people on Mars are in their early stages. People have walked on the moon, but it is not a planet. The remaining planets in the solar system either lack surfaces to walk on or are too hot for humans.
No. If there were no solid surface, what would you stand on?
If the planet (such as Jupiter or Saturn) were mostly gaseous, then it might be possible to use a hot-hydrogen balloon to study it. If a world were to be mostly water or fluid-covered, it ought to be possible to land with something like an amphibious aircraft - a "flying boat".
But without a solid surface, you can't walk on it.
Yes. You can walk on other planets because all planets have gravity to varying degrees. The hard part would be breathing because of the different atmospheres.
People have only walked on Earth.
You can walk on any of the inner planets. The outer planets (Jupiter, Saturn, Uranus, Neptune) you cannot walk on; they are made entirely of gas. This is only a guess, but Pluto is probably solid enough to walk on.
The other planets are not similar to dwarf planets.
The other planets actually do have seasons.
We need people that can walk in space to repair spaceships so that we can someday live on other planets.
No. We have only been able to walk on Earth. (And the moon.)
Terestrial planets have land, you can walk on them. But gaseous planets, if you step on them you would fall into a bunch of burning gas.
Some planets you can but some you can't.
what do you mean use other planets?
Yes.
People have only walked on Earth.
You can walk on any of the inner planets. The outer planets (Jupiter, Saturn, Uranus, Neptune) you cannot walk on; they are made entirely of gas. This is only a guess, but Pluto is probably solid enough to walk on.
Of the eight planets in our solar system, four have solid surfaces you could walk on. Those four planets are Mercury, Venus, Earth and Mars. You couldn't walk on Jupiter, Saturn, Uranus, or Neptune because they are made of gases, not solids. Mercury is too close to the sun and Venus is too hot for people to walk on. Everyone who has ever walked has, of course, walked on Earth. Scientists are seriously considering a manned mission to Mars, so that leaves Earth and Mars as the only two planets in the solar system on which you could walk.
The other planets are not similar to dwarf planets.
The other planets are not similar to dwarf planets.