What is a major scalability problem when relying solely on solar power for a powerful electric launch system?

Answer

The required size of the solar array needed to compensate for lower intensity further out in space becomes structurally unsound or too massive.

As distance from the Sun increases, the intensity of sunlight drops off sharply. To gather sufficient power, the required physical area of the solar arrays would become prohibitively large and heavy for a launch vehicle.

What is a major scalability problem when relying solely on solar power for a powerful electric launch system?
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