#Person1#: Did you watch TV last night, Rose? 
#Person2#: Yeah. I saw a science program. It was quite interesting. 
#Person1#: What was it about? 
#Person2#: Mars. Scientists say there might be water on it. 
#Person1#: If so, we may live there someday. 
#Person2#: I hope so. Did you know the US successfully sent two robotic explorers to Mars last month? 
#Person1#: Sure. I heard about this on the TV. On January 3rd , 2004, Explorer Spirit landed near the so-called Gusev Crater. And three weeks later, Spirit's twin explorer, Opportunity, landed on Meridiani Planum named by scientists. 
#Person2#: Yes. Both have sent back pictures of the planet. And the latter did a better job. 
Rose saw an interesting science program last night and tells #Person1# the program content.
science program