Gottwald M. The Earth. Space Travels 2024

Textbook in PDF format

About 80 years ago, it was possible for the first time to confirm what modern science had suggested for centuries: Earth shows its sphericity based on a curved horizon. The following age of space flights opened other opportunities. First, our home planet could be observed from low Earth orbits, and then, a while later, even from the distance of the Moon. Interplanetary space flights even shifted our perspective out into the universe. Images sent back from many spacecraft showed how Earth and its Moon are part of the solar system