The planet that's 'nearest' to the sun is Mercury.Earth is nearer to the sun than Mars is.
The planet that is closest to Earth depends on where the other planets are in relation to Earth. Venus can come the closest when it is on the same side of the Sun as the Earth, but Mars can be closest when Venus is on the far side of the Sun and Mars is on the same side of the sun as Earth.
None have. The only astronomical body outside of Earth that people have visited is the moon. The nearest planet is something like 200 times FARTHER than that.
Eris is not a planet; it is a dwarf planet. It is much smaller than Earth.
Earth is the only planet that people have ever walked on. The only other body away from Earth that people ever walked on is the Moon, and that has not happened in over 40 years. The nearest planet (Venus) is always more than 100 times farther away than the Moon is. Venus is hot enough to melt spacecraft and cook people, so even if it were possible, we would not send people to land on it. The next nearest planet (Mars) is always more than 140 times farther away than the Moon is.
The planet that is further from the Sun than Earth but closer than Jupiter is Mars. Mars is the fourth planet from the Sun, situated between Earth and Jupiter.
Mercury is the first planet from the sun, and Earth is the third planet from the sun; Venus is the second planet from the sun, making it farther than Mercury but closer than Earth.
It takes 77,000 years and longer than a life time to get to our nearest planet or (solar system).
It is a rocky planet that is much smaller and colder than earth.
Mars is the only planet which is both smaller and colder than the Earth.
Pluto is the dwarf planet that is smaller than the Earth's moon.
Eris is not a planet; it is a dwarf planet. It is much smaller than Earth.