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Speed of Light

The maximum velocity for everything in the universe; 186,282.397 miles (299,792.458 km) per second, or fast enough to go to the Moon and back in less than three seconds.

Radio Programs

Ether Filling the empty universe September 6, 2021

Moon and Companions A star that might not be there October 2, 2019

Foucault and Fizeau Two “enlightened” French scientists September 18, 2019

Moon and Regulus How time can stand still January 22, 2019

Moon and Aldebaran The bull’s eye shines into space September 29, 2018

Night Watch Picturing the distant stars April 3, 2016

Moon and Spica The end of a long journey February 26, 2016