tecznotes
Michal Migurski's notebook, listening post, and soapbox. Subscribe to 
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Dec 16, 2004 12:10am
light cones
Now this is a web service:
Xi Ursae Majoris is 27.2 light years away and only 5 weeks from the outer surface of your light cone - your ever-growing sphere of potential causality - which began its expansion from Earth on November 16 1977.
Courtesy of Matt Webb's Light Cone.
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