The diameter of the Milky way is about (), and the distance between the sun and the center of the Milky way is about ()

11000 light years (i.e. 10 ^ 18km)
26000 light years

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1. 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.
2. When can man fly out of the solar system? When can man fly out of the galaxy? Is the world beyond the earth wonderful
3. The diameter of human hair is about 7 * 10 ^ - 5 meters. How many nanometers is the diameter of human hair
4. The diameter of a hair is only about 7 × 10 negative quadratic mm, how many nm
5. 0.05um equals () nm equals () m equals () km
6. At present, the chip line width of the most advanced microelectronic devices in the world has been reduced to 0.13um. In a few years, it may be reduced to 0.05um, 0.05um=___ nm=___ m=__ km
7. How much is 0.05 μ m? How much is nm?
8. 0.05m=( )cm,5mm=( )m,0.7μm=（）nm,100cm=( )μm,30nm=( )km,2km=( )mm The answers should be expressed by scientific counting
9. 76x10, KM = M = DM = um = nm
10. (1)75μm= = m (2)15cm= = km (3)240dm= = km (4)0.36mm= = nm
11. The diameter of the Milky way is about 100000 light years. How many meters is the diameter of the Milky way
12. The diameter of the Milky way is about a, 60000 light-years B, 80000 light-years C, 100000 light-years D and 120000 light-years
13. 1. The Milky way is composed of about () billion to () billion stars, with a diameter of () million light years
14. The Milky way is 70000 light-years in diameter. How many years does it take to fly at 800 kilometers per hour
15. The diameter of the Milky way reaches 100000 light-years, about how many kilometers?
16. What is the 12th power nm of 3.6 * 10 equal to m
17. I think it's very difficult to convert the physical length unit into scientific counting method. What method can be simpler
18. The third power of 4.5 * 10 = km = DM = NM
19. Write scientific counting method after calculation 0.78km=（）m The sixth power of 1.3 * 10 83dm=（）um 30m=（）mm Using scientific counting (in the form of several powers)
20. 14m=____ cm=____ um=____ nm