Space

3. The large explosion at the end of a large star's life. It distributes most of the elements formed in the star across space
7. The time it takes for the Earth to orbit the Sun once
8. Rocky objects that orbit the Sun and vary in size from 1km to around 1000km
10. This type of reaction happens between nuclei within a star - this is how elements are formed
11. The beginning of a star's life - a cloud of dust and gas
13. Nebulae are mostly made up of this
14. When less than half of the illuminated part of the moon is visible

1. Depending on the mass at the start of the star's life, a supernova will form either a neutron star or a _____ ____
2. The moon doesn't produce its own light - it _____ light from the Sun
4. When the moon is not easily seen in the sky because the light from the Sun lands on the side of the moon which is facing away from the Earth
5. In a main sequence star, hydrogen nuclei fuse together to form _____ nuclei
6. A force that pulls us all down towards Earth
9. The time it takes for the Earth to do one full spin on its axis
12. Icy objects that orbit the Sun at very large distances. They can make their way into the inner solar system, where the Sun starts to melt them, producing a large tail made of gases and dust