Saturday, May 5, 2018

HOW OLD IS THE LIGHT FROM THE STARS?

















Every time we look at the Sun we see it as it was 8.3 light-minutes ago. 
Bob King



Easy-peasy time travel





It's fun-house mirror time! As we travel through time backwards and forwards, Sagittarius is transformed.
Courtesy of Tony Dunn with additions by author




Orbit Simulator



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