Make some mini moon craters

Before you begin 

• Use the safety checklist to help you plan and risk assess your activity. There's additional guidance to help you carry out your risk assessment, including examples.  Don’t forget to make sure all young people and adults involved in the activity know how to take part safely. 
• Make sure you’ll have enough adult helpers. You may need some parents and carers to help if you’re short on helpers.  
• Think about how many young people are attending the session and how many of each item you'll need, such as containers or baking trays. You’ll also need an extra set of equipment for demonstrating.  
• This activity works best in small groups, so that everyone can see and get involved. If you don’t have enough cake tins, you could use another type of container. 
• You may want to run this activity outside or put something down to help contain the mess. 

Setting up this activity 

• Add a layer of flour or sand to the bottom of each container. Next, sprinkle a thin layer of cocoa powder on top of the flour or sand.  You might find a sieve helpful for this bit. You could also add a handful of sprinkles over the top. 

 

Talk about what the Moon looks like 

1. Gather everyone together in a circle. 
2. Ask everyone what they think the Moon looks like. You might want to look at a photo or book that shows the Moon and what it looks like up close.  
3. Explain that the Moon always looks bright, but the Moon does not make its own light; it can only reflect light. We see the light reflected off the Moon’s white surface from the Sun.  
4. Ask everyone why they think the Moon looks different each night.  
5. As the Moon orbits around Earth, it changes shape. Sometimes it can be big and round; this is known as a Full Moon. At other times, the moon looks like the letter C or a croissant shape, and this is called a Crescent Moon. The Moon can also seem to disappear completely each month, and this is called the New Moon. The Moon's still there, but no light from the Sun can reach it to reflect off its surface. 
6. Ask if anyone knows what the circles on Moon’s surface are called. They’re holes and they’re called craters. You can see them when you look closely at the Moon. The Moon has a very rocky surface, with lots of mountains and valleys, just like here on Earth. The Moon’s surface doesn’t have any plants or water on it though, but it’s full of holes or craters.  
7. See if any knows, or can guess, how craters are formed. They’re made when large rocks floating through space, known as meteorites, crash into the Moon. 
8. Tell everyone that they’re going to explore how craters are formed. 

Make moon craters 

1. Show them your container and tell them that the brown cocoa powder is like the Moon’s surface.  
2. Pick up a pebble and explain that this is like the space rocks, known as meteoroids. Ask everyone what they think will happen when you drop the rock. 
3. Drop the pebble into the sand and talk about what happened. Does the coca powder still look the same? What’s moved and changed? What do they think happens when big space rocks hit into the Moon’s surface? Remember, craters are formed when objects, just like meteoroids, crash into the Moon’s surface. 
4. Divide everyone into small groups and give them a container each and a few pebbles. 
5. Everyone should take turns to have a go at creating Moon craters. Encourage them to chat to each other about what they can see. 
6. You could use rulers to measure the different sizes of the circles or craters formed by your pebbles, then get everyone to make predictions of how big the crater made by each pebble will be. You could also see if pebbles dropped closer or further away from the flour/sand will make a smaller or bigger crater.