Question

Why do we say love you to the moon and back in terms of heart beat?

Answer 1

The phrase "to the moon and back" basically means more than anything or more than anything else. The notion is using the distance from the Earth to the Moon and the return trip (or 455,000 miles or so) as a measure or unit or quantum of (say) love. In short, a lot.

Answer 2

Answer:

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Everyday, the heart generates enough energy to drive a truck 20 miles. ... So, when you tell someone you love them “to the moon and back” you're essentially saying you will love them with all the blood your heart pumps your whole life, which I think is equally meaningful.

$\mathcal{thnku :)}$