From 65 million years ago to April 1997, when a mile-wide asteroid 1997XF11 was discovered. Barely one day later, new data and calculations determined XF11 posed no danger - it was concluded that the asteroid will miss the Earth by 600,000 miles. It will be closer to the Earth than any other asteroid of that size, but 600,000 miles is still considered a comfortable distance. With Impact you can learn more about comets, asteroids and meteors. Also, you can browse an extensive photo library of these objects.
Impact contains some of the most breath-taking photos.
Interactive Quiz You are put in charge when a massive asteroid is heading to the Earth. You must choose among several options. A collection for your reference and education, something you can print and learn from. It is well designed and executed. It contains a wealth of well structured information.