The Universe is everything that exists. It is made up from all the ____ and dust. 13.8 billion years ago everything in the Universe was compacted into less space than a single ____ Then it began expanding, this is known as the Big ____ Theory. Time did not exist before the Big Bang. Galaxies are huge clusters of ____, gas and planets. A galaxy can have over 100 000 000 000 (____ billion) stars in them. The Universe could contain over two ____ galaxies (2 000 000 000 000). In 4 billion years our galaxy the ____ will collide with the Andromeda galaxy Stars are huge balls of ____, fuelled by ____ reactions. Blue stars are the hottest stars, red are the coldest. Our Sun is a star, and it converts four ____ kilograms of its mass (4,000,000,000 kg) into energy every second by the process of nuclear fusion. A solar system is a ____ of planets orbiting a central star. Our solar system contains ____ planets, several dwarf planets and ____ of comets and asteroids. A planet is an object that orbits a ____. It reflects light and produces no ____ It is estimated that every star has at least ____ planets orbiting it. We have even detected planets that orbit two stars. A moon is an object that orbits a ____ and reflects light. ____ has 69 moons, the most in our Solar System, the Earth has ____ moon and ____ has two moons. An exoplanet is a planet that exists ____ our solar system. The discovery of the first exoplanet was confirmed in ____ Now we have discovered over ____ and none of them are just like Earth.

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