Alex McColgan

It could be that some of these moonquakes detected by the old Apollo missions are caused by these thrust faults even today.

The images that we have of Lobate's scarps and the Moon show that they must be pretty young, certainly formed within the last 100 million years.

We know this because they can cut right through older craters, craters which are big enough that they would have likely formed billions of years ago, not recently.

Tidal forces from the Earth could also influence the location of these scarps as the Earth's gravity pulls on the Moon's crust.

Here you can see the location of the scarps across the Moon, and the arrows represent the direction of pull caused by the Earth's gravity.

Even with all these influences, however, it is thought that the Moon has only shrunk a total of 250 metres since it was formed.

Mercury, on the other hand, has had a much more tumultuous past.

It is thought that early in its life it was actually a molten world and has since cooled and solidified.

Mercury is also special in that it has a massive neighbour exerting an incredible amount of tidal forces on it, the Sun.

This means its contractions were much bigger than our moons.

Here you can see one such lobate scarp, which is about 2km high and hundreds of kilometres long.

In comparison to the Moon shrinking 300m, Mercury is thought to have shrunk by up to 4km.

So yes, the Moon is shrinking, but we don't need to worry about it disappearing any time soon.

I bet you didn't know the moon did this.

This isn't the camera moving, it's a real timelapse of the moon.

While the same face of the moon roughly faces the Earth at all times, there's much more wiggle room to that than you might think.

By taking a timelapse of the moon as it circles the Earth over the course of one month, we discover the truth of its wobbling path.

Yet, since fusion was first talked about as a serious contender for energy generation in the 1950s, it has become a cliché that is perpetually 30 years away from becoming reality.

As strange as it sounds now, at the turn of the last century, we didn't know what powered the sun.

The source of the heat and light that sustains all of life on Earth was a mystery.