|Discovering Planet "X"|
This activity and demonstration teaches the concept of parallax (the apparent movement of an object caused by a change in the viewer's position) and relates the concept to a real-world astronomical event, the discovery of Pluto. It employs the Blink Comparator, an online simulation illustrating the technique used by Clyde Tombaugh to discover the ninth planet on February 18, 1930.
Intended for grade levels:
Type of resource:
Adobe Acrobat reader
Cost / Copyright:
Copyright and other restrictions information is unknown.
DLESE Catalog ID: DLESE-000-000-009-198
This resource requires 'Blink Comparator'
Resource contact / Creator / Publisher:
Contact: Kerri Beisser
Space Department Education and Public Outreach Office
Johns Hopkins University Applied Physics Laboratory