Astronomy
| Set | Problems and solutions |
|---|---|
| Gravity | Gravity |
| File | Description |
|---|---|
| The Earth | Our planet rotating |
| Day and night | Map with day and night |
| The World illuminated by the Sun | The light on Earth |
| The antipodes | The other side of the planet |

| Set | Problems and solutions |
|---|---|
| Kepler's second law | Kepler's second law |
| File | Description |
|---|---|
| Satellite orbits | Satellites in orbit |