Lambda-CDM model

The Lambda-CDM model is a model that helps us to understand how our Universe works. It's like a recipe for how the Universe is made and how it behaves. The model says that the Universe is made of three ingredients: dark energy, dark matter, and ordinary matter. Dark energy is energy that is spread throughout the Universe and is pushing things apart. Dark matter is matter that we can't see but can feel its gravity which helps hold galaxies together. And ordinary matter is stuff like stars, planets, and people. The Lambda-CDM model explains why our Universe is the way it is and how it's expanding.