48 years ago today, the world’s largest air conditioned room (as it was called by The New York Times) was put into use for the first time. Players experimented with the use of orange balls for the sake of visibility. And there was a President among the spectators.
On April 9, 1965, the Astrodome opened, bringing baseball indoors. Mickey Mantle was not only the first at bat in the brand new stadium, he was also the first to hit a home run.