Matching. Read the information and match each word in bold with its definition.A mission to Mars would take at least a year—six months to get there and six months to return. This sounds like a long time, but think about it—people from Europe used to go on six-month journeys to Australia by ship. What's more difficult than getting to Mars is living there. People who want to live on Mars will have to find water. They would need water to survive, and they would probably have to take it with them from Earth. But scientists think water existed on Mars in the past and may still be under the surface of the planet. So, in time, the planet might be able to have water again. This would then make people on Mars more independent from Earth.(1) : able to live on one's own(2) : the outer part of something(3) : a special trip that has an aim or a goal(4) : trips, travels(5) : to stay alive