Try to imagine a planetary walk. All distances and diameters are scaled down by a factor of 1E-9 or 1 to 1 billion. On such a walk the Sun is a sphere of 1.4 m diameter.
From Sun to Earth you have to walk only 150 meter, Earth is a blue marble of 13 mm diameter.
To Pluto (49.305 AU or 7.37593 billion km) it is 7.37 km to walk. But be careful not to overlook Pluto, it's diameter is only 2.37 mm. The moons of Pluto: Charon is 1.2 mm, for Nix and Hydra you would need a microscope, they are about 50 µm, fifty millionth of a meter. The distance from Pluto to Hydra is only 0.05 m.
225088 Gonggong, Aphelion 101.238 AU (15.145 Tm), Perihelion 33.703 AU (5.042 Tm), diameter 1230 km. On our walk the distance to Gonggong is 5.042 to 15.145 km, it is 1.23 mm small. I love distances in terameter Tm, they are so easy to scale down by 1 billion.
Sedna is very far away, 76.257 AU (11.4079 Tm) to 937 AU (140.2 Tm), it's dimension is about 1000 km. On the planetary walk 11 to 140 km distance and the dimension 1 mm. Distances less than 15 km may be walked in less than 4 hours, but 140 km may take 7 seven days (20 km each day, then rest).
Read Wikipedia about the Sagan Planet Walk, I recommend reading carefully the Table of scaled sizes and distances. Both planet sizes and distances between them are scaled down to one five billionth of its actual size.
The smaller scale proposed by Greenhorn is not useful. If 1 AU (1.495E11 m) is scaled to 3 yard ( 3* 0.914 m), the Earth is 233 µm or 0.233 mm small. Pluto is too tiny to be seen. For a planetary walk both the distance and the dimension of the planets should be visible to the user. If you scale down to some meters only, even larger planets will be invisible.