Choose the word (a, b, c or d) that best fits each of the blank spaces. Edwin Hubble was an American (Question 36)___ whose research led to discoveries about galaxies and the nature of the (Question 37) ___. He settled a long debate by (Question 38)__ that the Andromeda nebula was located outside our galaxy, establishing the islands universe theory, (Question 39) ____ states that galaxies exit outside of our own. His (Question 40)___ of the distribution of galaxies resulted in Hubble’s Constant, a standard relationship between a galaxy’s distance from the earth and its speed of recession. By 1925, Hubble had devised a classification system for the structure of galaxies and provided (Question 41) __ observational evidence for the expansion of the universe. His work pushed the one-hundred-inch Mount Wilson telescope beyond (Question 42) ___ capability and provided strong impetus for the construction of an instrument twice its size at Mount Palomar, which Hubble used during his last years of research. The telescope that bears his name was (Question 43)____on a space (Question 44) ____ in 1990 and (Question 45)____ the earth, collecting data about the size of the universe. Question 36:
