Which sentence states a fact?

 - The Wright brothers successfully flew a plane for the first time in 1903.
 - The airplane was the most exciting invention of the 20th century.
The second sentence states a fact.
The Wright brothers successfully flew a plane for the first time in 1903.
It can be proved by reading a biography of the Wright brothers.
The first sentence states an opinion.
The airplane was the most exciting invention of the 20 th century.
Most exciting shows what a person believes, thinks, or feels. Another person might have a different opinion about what makes an invention exciting.