Fill in each blank with ONE suitable word. Space exploration costs a lot of money. Is it really necessary? Up to now, very few astronauts have had chances to visit space. (11)__________ space research has benefited humans in many ways. Satellites in space send information to (12)__________ the daily weather. Communications satellites mean easy and instant contact (13)__________ two people from afar. During the space trips, scientists can (14)__________ more about human bodies. Some scientists even (15)__________ of finding new homes for mankind on another planet.