WHY REGISTER?
Register if you like to comment or write captions.
1. It's simple and free.
2. Your username cannot be used by guests.
3. You can personalise your profile picture.
4. Comments remain editable for 5 mins after submitting.
5. There are no captchas when you submit a comment.
6. You are informed of replies to your comments.
7. Your comments are archived for future reference.
Register now and get your brain in gear.
How will SpaceX get us to Mars?
(8:23) The biggest challenge to getting humans to Mars, is the cost. Using the Space Shuttle, it cost $18,000 to lift 1 kilo to lower Earth orbit. With SpaceX's Falcon 9, the cost is $2,700. So how do SpaceX do it? real Engineering YT channel