The following year he discovered the true shape of the rings of Saturn. However others had different theories including Roberval and Boulliau . Boulliau had failed to detect Saturn's moon Titan so Huygens realised that he was using an inferior telescope.
Ang mga sumusunod na taon siya natuklasan ang tunay na hugis ng rings ng Saturn. Subalit ang iba ay may iba't-ibang theories kasama ang Roberval at Boulliau. Boulliau ay nabigo sa detect Saturn ng buwan Titan kaya Huygens realised na siya ay gumagamit ng isang bulok teleskopyo.