The public debate about Martian canals was not resolved until
A) many scientists were unable to reproduce Percival Lowell's sketches of Martian canals
B) the governing body of astronomy, the International Astronomical Union made an official statement on the matter
C) the first spacecraft flew past Mars in 1965
D) the first spacecraft landed on Mars in 1976

Question

Quizplus · Accepted Answer

The first spacecraft- Mariner 4- flew past Mars in 1965 and captured close-up images of the planet's surface, which showed no evidence of canals. This led to the resolution of the public debate about Martian canals.

The Public Debate About Martian Canals Was Not Resolved Until