Within a short duration of Congress funding the project many contractor and agencies lined up to be a part of this project. Five winning companies were chosen to develop the project. It should be noted that this Hubble telescope is a very ambitious and successful project undertaken by NASA. One of the significant companies was the Parker-Elmer Corporation. It was responsible for the creations of the telescope assembly itself. It took care of the mirrors used inside the design, the guidance sensors. Lockhead Martin was also a part of this project. Edwin Hubble an American astronomer was basically able to prove that the universe was expanding using the telescope. He used obscure light patterns and their wavelength to explain the process of expansion of the universe. As of 1990 this telescope comprises of five main parts they are wide field camera, Godddard spectrometer, High-speed photometer, faint object camera and faint object spectrometer.
The period of pulsation of the variables that were noted in the M100 were in fact related to the brightness. There is a direct relationship between the period and the brightness, so the more bright they burn the more they last and the less bright they burn the less the pulsation last. This was the hypothesis that was assumed. The distance to the M100 was calculated and then the absolute magnitude of the variables was then calculated. Using these absolute magnitudes it was then possible to calculate the distance to the Cepheid variables.