1. The Sun suddenly disappeared? What would Earth’s path in space be in response to such an event? Describe how Earth would change, as a result, and how humans might survive on a sunless planet. 2....

1. The Sun suddenly disappeared? What would Earth’s path in space be in response to such an event? Describe how Earth would change, as a result, and how humans might survive on a sunless planet.

2. The skies of Earth were perpetually cloudy? How might that have changed the history of our understanding of the cosmos, and how might humans under such conditions eventually learn what is really “out there”?