Nuclear Fusion - The process that releases energy so stars can shine, Billions - How many stars are in a galaxy, Many trillions - How many stars are in the Universe, One - How many stars are in the Solar System, Constellations - A small group of stars named to help navigation in the old days before GPS, 5 billion years - How long the Sun has left to live, Venus - The hottest planet, Mercury - The smallest planet, Star dust - What you are made of,  Hydrogen - What stars are mainly made of, Gravity - The force that makes the planets orbit the Sun, Jupiter - Planet with the most moons, Pluto - Dwarf planet and the name of one of Dr C's cats, Orbitting - Posh name for going round something, The Moon - A natural satellite of Earth, Earth - A natural satellite of the Sun, International Space Station - An artificial satellite of Earth, Milky Way - The galaxy we live in,

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