There seems to be a bit of a misunderstanding. Nebulae are not stars, but rather vast clouds of gas and dust in space. They are the birthplace of stars!

Here's what nebulae are made of:

* Gas: Mostly hydrogen and helium, with smaller amounts of other elements like oxygen, nitrogen, and carbon.

* Dust: Tiny particles of solid matter, like silicates, carbon compounds, and ice. These are often very cold.

How they form stars:

1. Gravity pulls the gas and dust particles together, causing them to clump.

2. As the clumps get bigger, they become denser and hotter.

3. Eventually, the core of the clump becomes so hot and dense that nuclear fusion starts.

4. This fusion process releases enormous amounts of energy, turning the clump into a star!

So, while nebulae don't contain stars, they are the material from which stars are formed. Think of them as the cosmic "nursery" for new stars!