For as long as humans have walked the Earth, the great endless sky and the countless stars that fill it have left us in a state of awe-inspired wonderment. Similarly, the study and exploration of space have been a priority for humankind for millennia. From the ancient Assyrians and Greeks, to the greatest minds of the Renaissance, and up to the billionaire space explorers of the 21st century, incredible amounts of time and effort have gone into better understanding our celestial surroundings. And yet, despite all of the great strides that have been made to understand the great beyond, it's estimated that 95% of the universe is still undiscovered.
Click through the gallery to learn about some of the greatest discoveries of astronomy and our universe.