Original caption:
Down is up and up is down. Or is it the other way around? Earth and a fortiori the whole solar system, even our home galaxy- endlessly float into space as the universe expands. As the Earth rotates around the Sun and on itself, it gives the impression that the sky is actually moving for an observer on its surface. That’s probably why it took so long for humanity to accept that the Sun was at the center of the solar system and not the Earth!