Real science: Some very interesting tidbits about space

Rachel Swirsky has been blogging from an event called Launch Pad - NASA folks interacting with science fiction community, as I understand.

I've read only one of the several reports she's filed so far - Day 3: Kevin R Grazier.

1. How dense is space?
2. Will you freeze/pop if exposed to space?
3. Our Sol is inside a dust buuble which is inside another dust bubble.
4. ...