The voyager space probes that visited the outer planets in the 70's and 80's, Voyager 1 and Voyager 2.
Voyager 1 flew by Jupiter and Saturn, while the Voyager 2 probe visited all four gas giant planets; Jupiter, Saturn, Uranus and Neptune.
Voyager 1 is the furthest man made object from Earth at around 122AU from Earth as of September 2012. That is 122 times the distance between the Earth and Sun.
Because there are only 8 planets in our solar system.
That is the planet Uranus.
Neptune is the major planet farthest from the sun.
Of the true planets in our solar system, Neptune is the farthest from Earth.
Traveled in perfect circles.
As of 2017, the farthest planets from our solar system are SWEEPS-11 and SWEEPS-04
That would have to be the Voyager Project. It left the Solar System some years ago and it's still going strong.
ERIS
About to exit our solar system
Voyager 2 and Voyager 10 There isn't a Voyager 10. You probably meant Pioneer 10.
Earth's moon is the farthest place in the Solar System that humans have visited as of 2017.
In our Solar System it would be Mercury.
MercuryVenusEarthMarsJupiterSaturnUranusNeptune
Because they are the farthest from the sun.
Neptune is farthest from the SunUranus is the coldest planet in our solar system
Pluto is a dwarf planet that can be found on the outermost area of our solar system, the farthest away from the Sun.
The smallest planet is mercury, and the planet farthest from the sun is Neptune.