Why is Pluto no longer a planet?
Our. Future. After taking job at the Lowell. Observatory in Flagstaff Arizona Young, American Astronomer Clyde Tombaugh joined the world's search for an elusive celestial object that must be influencing your ennis's strange dance in the night sky. The painstaking search technique was to take two photographs of the same section of the sky on different days using a machine that flip to rapidly back and forth between the two images stars and galaxies remained motionless but everything else could be identified by slight changes in. Their relative position Tombaugh spent a year examining pairs of photographs. Then in nineteen thirty, he noticed a tiny displacement within weeks. The observatory confirmed his finding and announced the discovery of the