[This Commentary originally appeared in the October 11, 1990 issue of The Mendon-Honeoye Falls-Lima Sentinel.]

One hundred and eighty six thousand miles per second. It takes light about one and one-third seconds to go from the Earth to the Moon. We know this because scientists have shot lasers at the reflectors the Apollo astronauts left on the lunar surface. The Moon orbits at a distance of 240,000 miles from the Earth.

One hundred and eighty six thousand miles per second. The light emitted from our Sun has aged a little over eight minutes by the time it hits the Earth. The Earth circles the Sun from a span of 93 million miles away.

One hundred and eighty six thousand miles per second. That’s equal to nearly six trillion miles in one year. We refer to this distance as one light-year. The nearest star (Proxima Centauri) looms a mere 4.3 light-years from our Solar System. That translates to just Continue Reading “The Speed of Light”