The SI (metric) unit for length, of course, is the meter. But for distances at that scale, the non-SI units light-year and parsec are often used instead.
One can not realistically measure the size of a galaxy in terms of the size of the Earth. One usually measures the size of a galaxy in terms of light years. The solar system of which the Earth is just a small speck sits in our local galaxy, the Milky Way which is 100,000 to 120,000 light years across, while the Andromeda galaxy is slightly larger at 220,000 light years in diameter.
The unit that measures wave frequency is hertz (Hz).
The unit that measures the amount of energy released by nutrients is the calorie.
The unit that measures electrical resistance is called ohm. It is represented by the symbol Ω.
1 square unit
Gram
It is degrees.
OHM
centimeters
A scale.
a litre.
Power