Fill in the Blanks About the spaceOnline version Listen to the conversation and complete the gaps with the correct words. by Jean Marie Mirandé 1 Teacher : So you've got a few minutes to discuss with your partner . Student 1 : So , as as I know , the main similarity between Mars and Earth is that they can both support human life . Student 2 : Yeah , but do we that's actually true ? I mean , Mars is much colder than Earth , it ? It says here it's about minus 55 degrees most of the time , whereas on Earth only places like Antarctica get that cold . Student 1 : True . Well then , I you could say both planets are a similar distance from the Sun ? Student 2 : No way ! Mars is much further away ! It here it's about 228 million kilometres , while Earth is about 150 million . Student 1 : Yes , but in space that's that far . Jupiter is , like , almost 780 million kilometres . That's why we astronomical units when we talk about distances in space . Earth is 1 astronomical unit from the Sun and Mars is 1 . 3 . The difference doesn't sound so big when you look at it that way . Student 2 : I see what you . Jupiter is 5 . 2 astronomical units so I guess you're right . What other similarities are there between the two planets ? Student 1 : Let's ? not the colour , obviously ! Student 2 : Yeah ! Earth is the blue planet and Mars is called the red planet for pretty obvious reasons ! Student 1 : Their sizes are pretty different . Mars is about half the size of Earth . Student 2 : What about this ? It like the days on both planets are almost the same length . Earth's day is 24 hours but Mars's is about half an hour longer . Student 1 : right . OK , any other things they both share ? Student 2 : I suppose you could say they have water in common . Student 1 : you ? How ? Student 2 : Well , Earth is 70 per cent water and Mars probably had huge oceans in the past . It's just that most of the water there now is probably frozen . Student 1 : Ah , I see . I don't we can say the air is the same , though . Most of Earth's air is nitrogen and oxygen , but Mars ? ? Student 2 : Mars really have air , not compared with Earth . It's got about one per cent as much air as Earth . Student 1 : Right , and it's mostly carbon dioxide . Student 2 : Gravity is another difference . I know this , but Mars has higher gravity than the Moon . But it's much less than on Earth , of course . Student 1 : Oh , yes . It says Mars about 38 per cent of Earth's gravity . Teacher : OK , let's see what you've found ?
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