This is a really tough topic, specially when the learners are above 10 and you need some "interactive help" to answer this difficult question in English as a Second language!!
Here you are some resources that can help children understand the scale of things in the universe. You can use them for planning your CLIL or CBLT units or just for extra information or support for displaying your universe projects
The Scale of the Universe 2 features a huge selection of objects in the universe that are arranged according to size and scale. You can zoom-in on the image to objects as small as neutrinos and quarks or as large as planets, constellations, and galaxies. When you click on an object in The Scale of the Universe 2 a small window of information about that object pops up.
3D Solar System Web features a narrated tour of the solar system beginning at the sun and working out through all of the planets. The tour explains the classifications of each planet, how long it takes each planet to orbit the sun, and each planet's unique features.
Magnifying the Universe is an interactive infographic that allows you to see the size of atoms, animals, buildings, mountains, planets, stars, and galaxies in relation to other objects in the universe.
100,000 Stars is a Google Chrome Web GL Experiment that does a good job of helping viewers understand the scale of the universe. 100,000 Stars is a visualization of the 100,000 stars closest to Earth. You can view the stars on your own or take an automated tour of the stars.
The Known Universe is a six minute video tour of the known universe that starts with Earth's biggest mountains in the Himalaya and zooms out from there. Watch the video below.
Hope you like them!