April 12 is International Day of Human Space Flight, celebrating the anniversary of cosmonaut Yuri Gagarin becoming the first human to leave Earth’s atmosphere, in 1961.
Since then, humanity has visited the lunar surface, set up the International Space Station, and we are now setting our sights on Mars as the next step in our journey.
If you're not in the spirit to celebrate humanity's advancement outside of our Earth, these quotes will probably change your mind.
Let's start with words from Gagarin himself:
Apollo 8 was the first manned mission to the moon, though no astronauts walked on the lunar surface:
Neil Armstrong became the first man to walk on the surface of the moon during the Apollo 11 mission:
Edgar Mitchell was on the Apollo 14 mission:
NASA's space shuttle program ran from 1972-2011:
In 1992 Mae Jemison became the first African-American woman in space.
Buzz Aldrin, the second man to walk on the moon, has been a staunch advocate for the human exploration of Mars:
Of course, no collection would be complete without the words of Carl Sagan illustrated with the picture of Earth taken by the Voyager 7 spacecraft, from a distance of 3.7 billion miles:
All images collected via NASA