The Hubble telescope satellite.
Neptune. It would be Pluto, but Pluto is a dwarf planet ( a planet that was a planet, but decided that it wasn't a planet)
If you still consider Pluto a planet, than Pluto takes the longest time to move around the sun. If not, Neptune takes the longest amount of time.
The dwarf Planet Pluto
Pluto
Pluto
PLUTO
Pluto
The dwarf planet Pluto. No "planet" takes that time.
It takes a space robot years just to get to a planet, Imagin Pluto, it would take about 50 years to get to pluto. That's why we just use the telescope.
Pluto.
The hubble telescope.
Pluto, it is now a dwarf planet or planetoid.