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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

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