Aşağıdaki cümlelerden hangisi uzay araştırmalarıyla ilgili geçmiş bir olayı anlatmaktadır?
A) Scientists will probably find new planets in the future.
B) SpaceX is planning to send people to Mars.
C) Yuri Gagarin was the first human in space in $1961$.
D) We hope to establish a base on the Moon someday.
