So it turns out that the universe is huge. It’s unlikely that we’ll ever be able to understand all of it. But modern technology has allowed space exploration that is constantly increasing our understanding of our own world and everything beyond it. Space Exploration Day is a holiday that celebrates these adventures through space on the day of the moon landing on July 20, 1969. The moon landing was just the beginning of what humans are capable of doing, and Space Exploration Day celebrates both achievements of the past and goals for the future.