| Submultiples | Symbol | Value | Multiples | Symbol | Value |
| deci | d | 10e-1 | deca | da | 10e1 |
| centi | c | 10e-2 | hecto | h | 10e2 |
| mili | m | 10e-3 | kilo | k | 10e3 |
| micro | u | 10e-6 | mega | M | 10e6 |
| nano | n | 10e-9 | giga | G | 10e9 |
| pico | p | 10e-12 | tera | T | 10e12 |
| femto | f | 10e-15 | peta | P | 10e15 |
| atto | a | 10e-18 | exa | E | 10e18 |
| zepto | z | 10e-21 | zetta | Z | 10e21 |
| yocto | y | 10e-25 | yotta | Y | 10e25 |
Fundamental measurement unit: metre kilogram second amper kelvin candela Complementary measurement unit: radian steradian Aditional measurement unit: bit, byte Related the distances measured in year light, at intergalactic dimesions, year-light become a too litle measurement unit. For example the visible universe ray is 15 000 000 000 light-year (a too unhandy number). If it used as example the petametre (Pm) or exametre (Em) It plied with digits much more just subunitary . If we using zettametre or yottametre (Zm, Ym) then the year light is a very little unit. For example in a astronomic year is 365 days 5h 48min 46s. Results that a year=31 556 926 seconds. At light speed in vacuum of (299.7924562±0.0000011)e+03 m/s accepting 299 792.458 km/s results a un year light = 9 460 528 412 464.108 km what means 9.46 Pm or 0.009 Em or 0.000 009 Zm or ... 0.000 000 009 Ym !! It can see what little is 1 year light besides 1 Ym !!! Then at distance of order of millions of year light can using zettametre and yottametre. |
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