Blue dwarf (red-dwarf stage)

Imagine if you could see stars outside, but everything was very far away. Some stars are very big and very bright, while others are smaller and weaker. These smaller stars are called red dwarfs.

Now, let's talk about what happens when a red dwarf star gets really old. Over time, it begins to run out of fuel, just like a car runs out of gas. When this happens, the star starts to shrink down and get smaller. This is because it doesn't have enough energy to keep itself big and bright.

As the star gets smaller, it also gets cooler. So, instead of being red like it was before, it starts to turn blue. This is called the blue dwarf stage.

During the blue dwarf stage, the star is still alive, but it's not as active as it used to be. It's kind of like an old person who can't run as fast or do as much as they used to. Eventually, the blue dwarf will completely run out of fuel and turn into a white dwarf.

So, in summary, red dwarfs are small stars that can eventually turn blue when they get old and run out of fuel. This is called the blue dwarf stage, and it's a sign that the star is reaching the end of its life.