It was a great summer, but now it' back to school.
Over the summer, my son introduced me to subredits.org. It's one of those sites like dig where people recommend web pages for you. Inte science reddit I found this great you tube video showing asteriod discoveries in our solar system over time. From the author of the video:
View of the solar system showing the locations of all the asteroids starting in 1980, as asteroids are discovered they are added to the map and highlighted white so you can pick out the new ones.
The final colour of an asteroids indicates how closely it comes to the inner solar system.
Earth Crossers are Red
Earth Approachers (Perihelion less than 1.3AU) are Yellow
All Others are Green
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