Teaching Earth and space in Year 5 so the scale actually lands

Ask a Year 5 class for the order of the planets and you will get it straight back, often in a rhythm they picked up in Year 2. Ask the same class to draw the solar system and you will get eight circles, evenly spaced, comfortably filling an A4 page. The order is the easy part. Scale is the part that does not land.

This matters more than it looks. The Year 5 objective asks pupils to describe the movement of the Earth and the other planets relative to the Sun, and a child who pictures a crowded solar system will struggle with everything built on top of it - why we have not sent people to Mars, why a year on Jupiter is not a year, why light takes time to arrive at all. The words come easily. The sense of distance has to be built.

Every diagram you have shown them is wrong

Not carelessly wrong - necessarily wrong. To fit a solar system onto a page, a textbook has to shrink the distances far more than it shrinks the planets. The result is a picture in which the planets are enormous and the gaps between them are small, which is the exact opposite of the truth. Pupils have been looking at that picture since Reception, and it is doing real work in their heads.

So say it out loud. Put the diagram on the board, tell the class it is useful and that it is also a lie, and explain that the lesson is about working out what it is lying about. Ten- and eleven-year-olds enjoy being let in on that.

Model one thing at a time

The common mistake is trying to show size and distance in the same model. It cannot be done in a school: a model that gets the distances right makes the planets too small to see. Pick one, model it properly, and do the other on a different day.

Five approaches that work in a primary school:

Give them the language of comparison

“Very big” and “really far away” are the vocabulary of a pupil who has not understood the scale, and they are easy to accept because they sound like knowledge. Insist on comparison instead. How many Earths would fit inside it. How many times further away than the Moon. How many years it would take to drive. Sentence stems on the wall push pupils into stating a relationship rather than reaching for an adjective, and they manage it far better than “very big” suggests.

A pupil who tells you Jupiter is very big has learned a word. A pupil who tells you how many Earths would fit inside it has learned a relationship.

Where an immersive session does the work a diagram cannot

Once pupils have done the arithmetic and the playground, an immersive session pays off properly. Flying a research vessel out past the inner planets gives them something a scale model cannot: duration. The gaps take time to cross even at an impossible speed, and a class that has just chalked a two-metre Sun understands exactly why the journey between two planets feels long.

Because the whole class is inside the same environment with the facilitator, the session can stop where it needs to - alongside a moon most pupils have never heard of, or at the point where Earth has become small enough to lose. Those pauses are where the scale lands, and they are why we treat the experience as a lesson rather than a ride.

Sequence matters. Do the maths first and the headsets second. A class that has already worked out roughly how far apart the planets are treats the session as confirmation of something they discovered themselves, which is a far stronger position than being shown something impressive and asked to be impressed by it.

Then test whether it landed. A fortnight later, ask one question: which is further away, the Moon or Mars, and roughly by how much? A class that can argue about the answer has understood the topic. A class that can only list the planets has memorised it.