Here's a bit more about what makes up a nebula:
* Gas: The most common gas in nebulae is hydrogen, followed by helium. These gases make up the vast majority of a nebula's mass.
* Dust: The dust particles are much smaller than grains of sand, and they are made of elements like carbon, silicon, and iron.
* Light: Nebulae often emit or reflect light, making them visible to us. The light can come from stars within the nebula, or from nearby stars that illuminate the dust and gas.
Nebulae are important in the universe because they are the birthplace of stars! As the gas and dust in a nebula collapse under gravity, they form new stars. So, next time you look up at the night sky and see a nebula, you're looking at a place where new stars are being born.
