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Pluto is closer than Neptune at perihelion. At aphelion its orbit is approximately 50 AU. If we use that as the radius of the solar system, then our solar system is 100 AU across.

In terms of light, it takes 8.3 minutes for sunlight to strike earth. The solar system's diameter would therefore be 830 light minutes, or 13.8 hours. Our solar system extends far beyond Pluto, however. Eris is nearly 100 AU at aphelion. As the largest known Kuiper belt object (bigger than Pluto/Charon), it is still MUCH closer than any Oort Cloud object.

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