Human Understanding of the Universe
Space technology is progressing at an amazing rate, enabling us and our instruments to travel farther and farther from Earth. In 1961, the first human went out into space, followed since then by more than 400 others. In your parents’ lifetime alone, a space-based laboratory has been established and robotic probes have landed on the Moon, Venus, Mars, an asteroid, and a moon of Saturn. Sophisticated telescopes have enabled us to see close-up images of every planet, and the Hubble Space Telescope has beamed back images that reveal the most distant regions of the universe.