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An object's speed determines whether or not it is in orbit. This activity is a lot like the one in Part 2, but with this one we see the entire Earth. Experiment with different speeds. Try to find a speed that will put the box into orbit around the Earth. Note: The Earth in this activity has no atmosphere to slow down the box. Nor are there any mountains that might get in the way of the box. The Point (again): An object's speed determines whether or not it is in orbit. Next: Summary Blueprint for a Space Station | Astronauts in Hard Hats Inspired by Science Fiction | Free-Falling | Resources Transcript | Site Map | Stationed in the Stars Home Editor's Picks | Previous Sites | Join Us/E-mail | TV/Web Schedule About NOVA | Teachers | Site Map | Shop | Jobs | Search | To print PBS Online | NOVA Online | WGBH © | Updated November 2000 |