---
title: "Science Can Be Revised"
description: "Scientific knowledge is provisional — it is the best current explanation based on available evidence, and it can and should be revised when better evidence arrives"
canonical: https://lightmysky.com/learn/science/science-can-be-revised-mt_1GVAmcwAiO
source: https://lightmysky.com/learn/science/science-can-be-revised-mt_1GVAmcwAiO.md
retrieved: 2026-10-19
---

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# Science Can Be Revised

Scientific knowledge is provisional — it is the best current explanation based on available evidence, and it can and should be revised when better evidence arrives

Subject: Science · Area: Scientific Inquiry · Ages 9 to 11
Page: https://lightmysky.com/learn/science/science-can-be-revised-mt_1GVAmcwAiO

## Ready when they can

- Give an example of a scientific idea that changed when new evidence was found — e.g. people once thought the Sun orbited the Earth
- Explain that scientists update their ideas when experiments give unexpected results, and that this is a strength not a weakness
- Describe why it is important to keep testing ideas rather than just accepting them because an expert said so

## Lesson: Science Can Be Revised

Scientists build their ideas from the evidence they have gathered so far. That means even a widely accepted idea is really our best explanation right now, not a fact carved in stone forever. When new evidence comes in, a good scientist changes the idea to fit it.

*(drawing: First people believe one idea. New evidence turns up. They update to a better idea.)*

**Example.** For a long time, people looked at the sky and thought the Sun circled the Earth, since that is what it looks like every day. When scientists studied the sky more closely, with telescopes and careful measurements, they found evidence that the Earth actually circles the Sun. Scientists changed the idea to match what the evidence showed.

**Tip.** If an experiment gives you a surprising result, that is not something to hide. It is a clue that your idea might need updating, and that is exactly how science moves forward.

**Recap.** Science isn't stuck. It gets better each time new evidence updates an old idea.

## Practice

8 questions on this page, each with its working shown.

## Needs first

- [Could there be another explanation?](https://lightmysky.com/learn/science/could-there-be-another-explanation-mt_QrVF5n7vci)
- [Reflecting After Learning](https://lightmysky.com/learn/learning-to-learn/reflecting-after-learning-mt_v5yDTWEiyQ)
- [Correlation vs Causation](https://lightmysky.com/learn/science/correlation-vs-causation-mt_X0Tr8IYaEd)

## Opens up

- [Evidence Supporting Ideas](https://lightmysky.com/learn/science/evidence-supporting-ideas-mt_AstzvYDU2m)