one light year is the distance that light travels in one

one light year is the distance that light travels in one The distance light can teavel in one year,which is 9 500 000 The parcel is three times as light as that one. 说明理由1.The fastest thing in space is light.Light travels ____ The distance in the universe is told ___ light years . one-light the light of one's 英语：That light travels in straight lines is known to all. It is known to all that light travels in straight lines. What is known to us that the light travels faster than sound the()thing in the universe is light,it travels at 300000 km The speed ______ light travels is said to be the maximum in