handheld - Small enough to be held in the hand while being used., emission - Sending out something into the open, for example a smell, a sound, smoke, heat or light., environmental - Relating to the natural world and the impact of human activity on its condition., environmentalist - A person who wants to protect the environment., renewable - (used about sources of energy) that can be replaced naturally, science fiction (sci-fi) - A type of writing about imagined developments in science and their effect on life especially in the future or outside the Earth., colony - A group of people who go to live permanently in another country but keep their own habits and customs., orbit - To move around a much larger object, especially a planet, a star, etc., exploration - The act of travelling around a place in order to learn about it., industry - The people and activities involved in one type of business that produces goods or offers services., mines - A deep hole, or a system of passages under the ground where minerals such as coal, tin, gold, etc. are dug., physicist - A person who studies or is an expert in physics., greenhouses - Buildings made of glass in which plants are grown., filter - A device that a liquid or gas is passed through in order to remove any materials that aren’t wanted., spread - To cover a larger and larger area., mineral - A substance that is naturally present in the Earth, for example gold and salt. It can also be present in drinks and food., reduce - To make something less or smaller., absorb - To take in and hold something., atmosphere - The mixture of gases that surrounds the earth or any other star, planet, etc.,

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