It's not that we see "all sides" of the moon, but rather we only see one side of the moon from Earth. This is because the moon's rotation period is perfectly synchronized with its orbital period around Earth.

Here's a breakdown:

* Rotation: The moon rotates on its axis once every 27.3 days.

* Orbit: The moon orbits Earth once every 27.3 days.

Since these periods are equal, the same side of the moon always faces Earth. We call this side the near side, and the opposite side the far side.

Why is this?

This synchronization is thought to be due to tidal forces from Earth. Early in its formation, the moon was rotating faster. However, the Earth's gravity pulled on the moon's near side more strongly than its far side, creating a tidal bulge. This bulge slowed the moon's rotation until it matched its orbital period, leading to the synchronized state we see today.

So, can we see the far side of the moon?

Yes, but not directly from Earth. We've been able to see the far side of the moon thanks to:

* Spacecraft missions: Early probes, like Luna 3 in 1959, captured the first images of the far side.

* Orbiting satellites: Today, we have detailed maps of the moon's far side thanks to satellites like the Lunar Reconnaissance Orbiter.

So, while we can't see the far side of the moon from Earth, we have a good understanding of what it looks like thanks to these technological advancements.