Which telescope design innovation, introduced in 1979, eliminated the central obstruction problem of traditional reflectors while maintaining compact size?

The telescope has been one of astronomy's most transformative products, evolving dramatically since its invention. This poll tests your knowledge about a significant product innovation in telescope design that changed how both professional and amateur astronomers observe the cosmos. Do you know which revolutionary design overcame a critical limitation of traditional reflector telescopes?

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• Schmidt-Cassegrain Telescope (SCT)
• Ritchey-Chrétien Telescope
• Maksutov-Cassegrain Telescope
• Dobsonian Off-Axis Reflector

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