Did you watch TV last night , Rose ?
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user
Yeah . I saw a science program . It was quite interesting .
happiness
assistant
What was it about ?
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user
Mars . Scientists say there might be water on it .
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assistant
If so , we may live there someday .
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user
I hope so . Did you know the US successfully sent two robotic explorers to Mars last month ?
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assistant
Sure . I heard about this on the TV . On January 3rd , 2004 , Explorer Spirit landed near the so-called Guser Crater . And three weeks later , Spirit's twin explorer , Opportunity , landed on Meridian Planum named by scientists .
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user
Yes . Both have sent back pictures of the planet . And the latter did a better job .
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assistant