Which of the following describes a feature of the Apollo 11 mission?

The Apollo 11 mission is significant in the history of space exploration primarily because it successfully landed astronauts on the moon on July 20, 1969. This historic event marked the first time humans set foot on another celestial body, with astronauts Neil Armstrong and Edwin "Buzz" Aldrin taking the first steps, while Michael Collins orbited the moon in the command module. This achievement fulfilled a national objective set by President John F. Kennedy, showcasing advancements in technology and human ingenuity during a pivotal period of the space race. The successful lunar landing was a milestone that demonstrated the capability of human space travel beyond Earth’s orbit.

In contrast, the other choices do not accurately describe features of the Apollo 11 mission. For instance, sending humans to Mars is not applicable, as Apollo 11 was solely focused on lunar exploration. Additionally, the mission involved human astronauts rather than exclusively robotic spacecraft, and it wasn't the first space mission to orbit Earth, a feat accomplished earlier by missions such as Vostok 1.