OUR VIEW OF THE UNIVERSE
The technological progress made in just one century has opened wide our windows on the universe.
For millenia humans have gazed at the stars and planets and wondered how far-away they lay, what they were made of, and how they got there.
Skywatchers have charted and analyzed these celestial bodies—first with quadrants and armillaries, then using telescopes, spectroscopes, and spacecraft. The Moon and planets have been mapped, and thousands of star clusters, nebulas, and galaxies have been cataloged.
Today, huge telescopes and sensitive satellites examine the stars, and probes have been sent to some planets, but the goal remains the same: to discover what the universe is and why it is the way it is.