HAVING now been engaged for a number of years in measuring the velocity of light by means of the rotating mirror, I have succeeded in rearranging the apparatus in such a manner as, by means simply of ...

Compared with intergalactic space, our galaxy is gravitationally dense. Compared with interstellar space, our solar system is gravitationally dense. We know that light waves bend with gravitational ...

In the summer of 1926, an experimental beam of light pierced the night sky between two precisely measured peaks in the San Gabriel Mountains, and science history was made. Virtually unseen by the ...

1845: French physicists Armand H. L. Fizeau and J. Leon Foucault take the first photograph of the sun. Photography was in its infancy -- and the widespread use of photography in astronomy was still ...

1845: French physicists Armand H. L. Fizeau and J. Leon Foucault take the first photograph of the sun. Photography was in its infancy -- and the widespread use of photography in astronomy was still ...