dark grey star
書迷正在閱讀：花豹事變、兄妹游戲（骨科h）、快穿之無限勾引、花間yin事Ⅲ、桃花扇（古言，1V2）、玫瑰城堡（校園h）、燃燒淹沒房屋（校園H）、夜雨寄情（校園1v1）、野雞吃奶現場（仙俠 高H）、黑薔薇（1V2 校園H）
dark grey star
dark grey star The age of the universe is 13.8 billion years, and the diameter is about 93 billion light-years The Pisces-Cetus Supercluster plex is 1 billion light-years long and 150 million light-years wide. The Laniakea super gaxy has a diameter of 520 million light-years and tains 100,000 gaxies. The Virgo Supercluster is 100 million light-years in diameter and tains 47,000 gaxies. The Local Group of Gaxies is 10 million light-years in diameter and tains 50 gaxies The Andromeda Gaxy is 220,000 light-years in diameter and has 1 trillion stars. The Milky Way is 180,000 light-years in diameter and has 400 billion stars. What is the cept of light year only used units in astronomy are parsecs, astronomical units and light seds An astronomical unit is 149,597,870,700 meters A light sed is the distaraveled by light in one sed and is 299,792,458 meters. A light-year is 9,460,528,177,426.821 meters. One parsec equals 3.26 light years The speed of the earth&039;<sup id="0bgj4"></sup>