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But it is not clear that it makes sense to ask "how" a mass produces a gravitational field, say.
In Newton's theory, "mass" and "gravitational field" are fundamental concepts.
[It] is enough that gravity does really exist and act according to the laws which we have explained, and abundantly serves to account for all the motions of the celestial bodies, and of our sea."25 Similarly, Einstein's theory, while it gives a deeper understanding of what a gravitational field is, namely the curving of space-time, does not explain "how" a massive body causes that cur- vature, in the sense of a mechanism.
The mass of Earth gives rise to a gravitational field.
Earth's mass can be said to be the cause of the gravitational field, but Earth's mass does not "happen before" the gravitational field.
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