What Is a Model in Science?
Scientists use models to help explain things that are too big, too small, too slow, or too complex to observe directly. A model is not a perfect copy of reality — it is a simplified representation that helps us understand how something works.
A representation of a system or idea that helps scientists explain observations, make predictions, and communicate ideas. Models can be physical objects, diagrams, computer simulations, or mathematical equations.
Models are incredibly useful, but they always have limitations. As we learn more, models get updated or replaced with better ones. This is a normal and healthy part of how science works!
Think of a model like a map. A map of your city is not the actual city — it's a simplified version. It helps you navigate, but it doesn't show you every tree or building. Scientists' models of Earth systems work the same way: they capture the most important features to help us understand and explore.
Models of Earth in the Universe
Throughout history, people have tried to make sense of what they saw in the sky. Two of the most famous thinkers who created models of the universe lived thousands of years apart and had very different ideas.
The two major historical models are:
- The geocentric model — Earth is at the centre of the universe
- The heliocentric model — the Sun is at the centre of the solar system
The word geocentric comes from the Greek word geo meaning Earth, and kentron meaning centre. Heliocentric comes from helios meaning Sun. Knowing these roots can help you remember which model is which!
10 more sections in this topic
Pick this up in your Library: it holds the whole topic, notes, cheatsheet and questions.