For example, Mars doesn't really have active volcanoes now, but billions of years ago, volcanoes were a big deal on the red planet.

Mars is kind of a almost volcanically dead world now.

It's very tiny, so it lost all the heat it had inside, so without that heat, it can't really make any more volcanoes.

But back in the day, a couple of billion years ago, it used to erupt lava floods so frequently that it, you know, could bury the United Kingdom in a, in a couple of weeks and, uh, you know, it was just very good at making lava.

And the difference between Mars and Earth is Earth has tectonic plates, you know, these sort of jigsaw pieces that keep moving on the surface of the world.

So when you have these plumes of super hot material that come up from the, the Earth's, like, molten heart and just act like a blowtorch on the surface, the tectonic plate keeps moving, so you get chains of volcanoes.

On Mars, for some reason, it never had plate tectonics.

Today, scientists think that Venus might be so hot and unpleasant because of a string of super volcano explosions billions of years ago.