What does the dark side of the Moon show and how did we discover it?

What does the dark side of the Moon show and how did we discover it?

When the Moon orbits around our planet, it always turns the same face towards us but in reality it has another one that appears hidden from us: the reason for this phenomenon lies in the fact that its rotation period (i.e. the time taken by the Moon to complete one revolution on itself) is equal … Read more