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Last updated at 15:20 GMT, Friday, 10 December 2010

Alien contact

A futuristic picture of man on Mars

There has been some discussion in the media recently about how we might react if we encountered alien life forms. In this programme, Rob and Alice wonder, if aliens visited Earth, who would be the first person to speak to them?

This week's question:
In what year did man first walk on the moon?

a) 1967

b) 1973

c) 1969

Listen out for the answer in the programme.

Listen

Alien contact

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Vocabulary

alien life form

non-human type of life from another planet

science fiction

type of story based around the imagined impact of science and technology on society

extra-terrestrial

something that is not from our planet

ambassador

person who is the first point of contact for visitors; often acts as a host to welcome guests

fanciful

unreal or imagined

orbiting

moving around in circles, like the earth goes around or orbits the sun

appointment

giving a person a job or position of responsibility

non-proliferation

agreement to limit expansion or development

weapons

objects such as knives, guns or bombs used for attacking

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