By 2006, 13 rings had been discovered around Uranus. Each of the following methods had discovered some of them, EXCEPT ONE. Which method did NOT yield discovery of some of Uranus's rings?
A)observations from Earth of the occultation of a star by the ring system
B)direct observation by astronauts from space
C)observation by the robotic Voyager 2 flyby mission
D)observations from Earth's orbit by the Hubble Space Telescope

Question

Quizplus · Accepted Answer

Astronauts have never been sent to Uranus, so direct observation by astronauts from space is not possible.

By 2006, 13 Rings Had Been Discovered Around Uranus