ed 5 artificial satellite a device that orbits the Earth to collect scientific data or to be used in communications. asteroid a large rock that orbits the Sun, especially in the asteroid belt. astronomer a person who studies space and the Universe. big bang theory the theory that defends that the Universe began as just a single point, then expanded. celestial body an object in space, such as a star, a planet, an asteroid or a comet. climate change the long-term changes in temperatures and weather patterns mainly caused by high levels of carbon dioxide and other gases. comet a ball of dust and ice that orbits the Sun. dwarf planet a celestial body smaller than a planet that orbits a star. eclipse an event where one celestial body obscures the light of another. galaxy a group of millions of stars and the celestial bodies that orbit them. global warming the increase in the average temperature of the Earth's air and oceans. greenhouse gas a gas, such as carbon dioxide and methane, that covers the Earth and traps the Sun's heat. lunar eclipse an event where the Earth passes between the Sun and the Moon. Milky Way the spiral galaxy where the Solar System is located. Moon the Earth's only natural satellite. Moon phase a change in the Moon's appearance as seen from the Earth. orbit the curved path of a celestial body as it travels around a star. planet a large, spherical celestial body that orbits a star. revolution the movement of the Earth as it revolves around the Sun. rotation the movement of the Earth as it spins on its own axis. solar eclipse an event where the Moon passes between the Sun and the Earth. Solar System the Sun and all the planets that orbit it. star an enormous sphere of gas that produces a great deal of light and heat. stargazing the activity of studying the stars. Sun the star that is the centre of the Solar System. tide the regular rise and fall of the sea level due to the Moon's gravitational pull on the Earth. Universe everything that exists in space. It is made up of hundreds of billions of galaxies. K E Y VO C A B U L A RY · We love the Universe WRITE out a definition on a strip of paper. Your partner reads it and guesses the word. Take turns to write and gues s. 280 · t w o h u n d r e d a n d e i g h t y
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