If you would like to use a youtube in your movie. You can use a tool like http://keepvid.com/ Paste the link into this tool and you will be able to download your youtube clip.
Alway remember to reference any youtubes or pictures to the original author and location.
Here is a calculator to work out how big your planet is to scale.
What would you need to live on another planet? That is your task for the rest of this term. The link below has lots of questions your could ask yourself to help you with the project if you are stuck for ideas.
The project sheet has many videos with ideas on living in space, and making food in the future. Watch the videos to get ideas on how to make your space settlement or shelter more livable.