Which revolutionary telescope design, first introduced in 1668, eliminated chromatic aberration and became a fundamental innovation in astronomical observation?

Before modern digital astronomy tools, one innovative optical instrument dramatically transformed our understanding of the cosmos. This poll tests your knowledge about a groundbreaking product design in astronomical history that fundamentally changed how scientists observed and studied the universe. The innovation opened new frontiers in space exploration and continues to influence modern telescope design. Do you know which revolutionary telescope design marked a turning point for astronomy?

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The Newtonian Reflector, using mirrors instead of lenses to focus light
The Galilean Refractor, with a convex objective lens and concave eyepiece
The Gregorian Telescope, featuring two concave mirrors in alignment
The Reflecting Telescope, invented by Isaac Newton to eliminate color distortion