some important unit of physics
1. 1Fermi=10^-15m.
2. 1 Angstrom =10^-10.
3. 1 Micron=10^-6.
4. 1 Light Year =9.46*10^12 km(approx.)
5. 1 Astronomical Unit(1AU)=1.496*10^8 km(approx.)
6. 1 Persec(largest unit of distance)=3.26 light year.
7. Velocity of Light =3*10^8 m/sec.
