Key Discoveries in Earth and Space Science

What are Earth's systems, cycles, and resources? What are the solar system, lunar phases, and gravity? Who first studied these concepts and why? And who built upon those early theories to take scientific understanding further? Fascinating timelines provide a visual representation of how the scientific concepts of Earth and space developed over time. The intriguing stories that follow show the connections between scientists and explain how theories were built upon or completely overturned by new discoveries.