In 1664, who discovered the fifth star in the Trapezium, an asterism (mini-constellation) in the constellation Orion?

Robert Hooke

The correct answer is option 4. Robert Hooke.

The discovery of the fifth star in the Trapezium, an asterism in the constellation Orion, is attributed to Robert Hooke.

Robert Hooke, an English scientist, is credited with the discovery of the fifth star in the Trapezium in 1664. The Trapezium is a group of young stars located within the Orion Nebula. Hooke's discovery contributed to the understanding of celestial objects and their arrangements within constellations.