Question

why universal law of gravitation called universal

Answer 1

It is called universal because it is universally true and will not change from place to place.

Answer 2

Hey mate here is your answer

It is called so because it is applicable on all bodies having mass, and the bodies will be governed by the same law, that is newton's law of gravitation. Thus, as it is applicable universally, it is called as universal law.

Hope this answer will help you!!