WASHINGTON (AFP) – The Hubble space telescope, the object of NASA's fifth and last servicing mission next week, is a veritable time machine that has revolutionized humankind's vision and comprehension of the universe. Put into orbit at an altitude of 600 kilometers (360 miles) by the shuttle Discovery on April 25, 1990, Hubble has transmitted more than 750,000 spectacular images and streams of data from the ends of the universe, opening a new era in astronomy. But the telescope, the fruit of a collaboration between NASA and the European Space Agency, had a troubled start and did not become operational...