What is this Nat Geo video mainly about?
This video talks a lot about "reusable" rockets.
What does "reusable" mean in this context?
What does the prefix "re–" mean?
This video mentions the "microgravity" on Mars.
What does "microgravity" mean in this context?
What American spent a year in space?
What happens to astronauts that spend a long time in space?
Host, Andrew Fazekas, thinks that terraforming is a "fascinating" idea.
What do the two expert panelists think?
What does Ray Arvidson describe about problems with terraforming?
At the very beginning, the moderator says that Mars is within the "Habitable Zone."
What does the "Habitable Zone." mean?
After the shuttle takes off in the fifth minute of the movie, why do people cry?