Este fue
tu cielo.

The Millennium that Defined Earth

When the second millennium began, people knew Earth was round, but few saw beyond their local village. As the millennium progressed, humans mapped continents, circumnavigated the globe, and determined Earth's composition. Earth went from the center of everything to a planet in the Solar System, then in a Galaxy, then in a Local Group of Galaxies, then in a vast expanse we call the Universe.