Which innovative telescope design product, introduced in the 1970s, revolutionized astronomy by eliminating the central obstruction found in traditional reflector telescopes?

The field of astronomy has been transformed by numerous technological innovations over the decades. From simple telescopes to sophisticated space observatories, product design and technology advancements have pushed the boundaries of our cosmic understanding. This poll tests your knowledge about one of the most significant product design breakthroughs that revolutionized how astronomers observe distant celestial bodies and collect data.

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Schmidt-Cassegrain Telescope (SCT)
Dobsonian Telescope
Maksutov-Cassegrain Telescope
Ritchey-Chrétien Telescope