NASA's Cassini satellite has spent in the orbit of Saturn for over a decade and has taken many photos of Saturn and its moons and this is the pic of its moons coming into perfect alignment.
The Curiosity rover sings Happy Birthday song to itself alone on Mars every year on its birthday.
This might look simple but it has so much related to the human race. It was affixed to Pioneer 10 and Pioneer 11 space crafts in 1972 and 1973 respectively which were first set to leave solar system so that the aliens could read and find out about the humans.
This picture was taken in 1984 as Astronaut McCandless was 100 meters away from the cargo bay and is the farthest any human has ever been in outer space. PS : He was equipped with jetpacks with nitrogen thrusters controlled by the unit