It is known that the speed of light is 300000 kg / s. after one year, light has walked____________ Km. Light is known to be emitted from one side of the galaxy, It is known that the speed of light is 300000 kg / s. after one year, light has walked____________ It is known that light is emitted from one side of the Milky way, and the time when light reaches the opposite side is 70000a, then the diameter of the Milky way is about___________ km.

It is known that the speed of light is 300000 kg / s. after one year, light has walked____________ Km. Light is known to be emitted from one side of the galaxy, It is known that the speed of light is 300000 kg / s. after one year, light has walked____________ It is known that light is emitted from one side of the Milky way, and the time when light reaches the opposite side is 70000a, then the diameter of the Milky way is about___________ km.

300000×3600×24×365=9460800000000km=9.4608×10^12km
9.4608×10^12×7000=6.62256×10^17 km