What was the primary physical obstruction preventing Apollo landings on the far side?

Answer

The intervening mass of the Moon blocked the direct line of sight for radio communication signals.

The difficulty centered entirely on signal blockage; when a spacecraft is on the far side, the body of the Moon physically blocks the direct line of sight required for two-way communication with terrestrial tracking stations.

What was the primary physical obstruction preventing Apollo landings on the far side?

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