The International System of Units (SI) Multiples and Submultiples from International System of Unit
| 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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