What are gravastars?

Gravastars are space bubbles that act like super strong balls made of energy and matter.

Imagine you have a balloon filled with air, when you blow it up, it stretches and gets bigger. Now think about a gravastar as a kind of super-stretched bubble in space, but instead of air, it's full of something really special called dark energy. This dark energy pushes outwards, just like the air in your balloon.

Now, imagine that balloon is inside another balloon, the first one is pushing outwards with dark energy, and the second one is made of regular matter (like you or me). That’s kind of what a gravastar looks like: it's a bubble of dark energy wrapped by a layer of normal matter. It helps scientists explain how some very heavy things in space, like black holes, might work.

Sometimes, when the inside of a gravastar gets too stretched and tired, it can pop or change shape, like your balloon popping if you blow it up too much! That’s one fun way to imagine what happens in the middle of these space bubbles.