Exploration of the Universe would increase when astronomers learned to use infrared, microwaves, and other components of the electromagnetic wave spectrum. Up until the 1920's astronomer’s observation was hindered by their tools. During World War II, technology advanced on the use of radio transmission. Astronomers realized that they could use this technology to see the Universe, not with "eyes," but through the transmission and reception of microwaves, infrared, ultraviolet, x-ray, and gamma rays. The Universe would slowly unfold its secrets to researchers. Presently new advances in the technical ability to search the Universe, has allowed some of Einstein's mathematical theories to be proved or disproved. However, the field is still in its infancy.