1. Is there any evidence that Earth has ever passed through a star-forming region in space? 2. The solar system passed through a giant molecular cloud? How would this encounter affect Earth and life...

1. Is there any evidence that Earth has ever passed through a star-forming region in space?

2. The solar system passed through a giant molecular cloud? How would this encounter affect Earth and life on it?

3. The Sun began entering its giant phase today? What would happen to Earth and to life on it?