Space & Astronomy FAQ
This is an ever-growing list of common questions about space and astronomy, grouped into categories.
- How big is the Solar System?
- Which planets have water?
- Which planet has no water?
- Which planet has no atmosphere?
- Which is the smallest planet?
- What is the Universe?
- How big is the Universe?
- What shape is the Universe?
- How old is the Universe?
- What is the Multiverse?
- Why was the Apollo program cancelled?
- Why haven't people been back to the Moon?
- How do you go to the toilet in space?
- How do you sleep in space?
- How long would you survive in a vacuum?
- How much will it cost to go into space?