易叉叉叨叨
光年（light-yar） 指光以299,792,458米/秒的速度在真空中1年所走的距离.1光年约相当于94,605亿公里或63,240天文单位.3.262光年约等于1秒差距.有时人们还据此引入“光时、光分”的表示方法.光年简写作：“ly” 天文单位（astrono mical） 地球绕太阳旋转的椭圆轨道半长轴的长度,其值为149,597,870公里.通常则指地球到太阳的平均距离.天文单位简写作：“AU” 秒差距（parsec) 量度天体距离的单位,主要用于太阳系以外.天体的周年视差为1〃,其距离即为1秒差距.更长的距离单位有千秒差距和百万秒差距.1秒差距=3.2616光年=206,265天文单位=308,568亿公里.秒差距简写作：“pc” 由于1秒差距=3.2616光年=206,265天文单位=308,568亿公里 所以你要找的比光年更大的单位应该是 秒差距
shishan786
light-yearThe distance that light travels in a vacuum in one year, approximately 9.46 trillion (9.46 × 1012) kilometers or 5.88 trillion (5.88 × 10 12) miles.
yechenchao77
light-year 或 lightyear1 light-year = 9.4605284 × 1015 metersA light-year is a unit of length used by astronomers to measure interstellar distance (the distance between stars). A light-year is defined as the distance that light will travel in a year. If the speed of light is 186,000 miles per second (300,000 km per second), then calculate the distance that light will travel in one year. Express your answer in miles per year.
