We live in a part of the night sky called the Milky Way Galaxy. Our galaxy can be seen (67) the naked eye at a clear summer night. It (68) a ribbon stretched across the night sky.During the summer is (69) the Milky Way is at its fullest with the stars clustered (70) . Our galaxy is a gigantic agglomeration of stars whose numbers will probably never been (71) , though technology advanced rapidly.Currently we (72) this number to be about thirty billion. Scientists have assumed that the radius of our galaxy, (73) it were to be traveled, would (74) us about fifty thousand light years. We live in small part of the Milky Way Galaxy, which is (75) to as solar system. The solar system is made up of nine planets, which (76) the center of galaxy.At the center of our (77) is the Sun. Mercury is the planet nearest to the Sun.As it does not (78) , it keeps the same face (79) the Sun at all times. This (80) that one side of the planet has a (81) burning day of 900 F, and the other side a (82) that is deadly colD、Therefore, life on mercury would be (83) Mercury is the fastest traveling (84) the nine planets, making one (85) circle around the Sun in only eight days. Mercury has little or no atmosphere to diffuse the Sun light. You would also weigh considerable less (86) the lack of gravity.