Why Keyholes Make It So Difficult To Predict Asteroid Impacts

There are thousands of asteroids which regularly come close to the earth and have a chance of one day hitting the Earth, potentially causing a major disaster. However despite the laws of physics enabling us to predict the motion of the planets with precision for thousands of years, we can't do the same for these asteroids, because they all end up having a close approach with the Earth that makes it almost impossible to predict their orbit after this.

Thanks to Rusty Schweickart for suggesting this subject.

This video features lots of sequences captured from Universe Sandbox you can buy a copy here and help support the channel.
http://universesandbox.com/scottmanley

Thanks to Scott Vaughen for creating the hyperbolic orbit tool.

Видео Why Keyholes Make It So Difficult To Predict Asteroid Impacts канала Scott Manley