Why have unmanned missions been sent to Mars in the past?
What has made manned missions possible now?
What could be some of the consequences of sending a group of astronauts one way?
Have a go at finding some more information using the search engines in the boxes below. Sweet Search and ipl2 both search the internet for useful information for students.
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Try to find out more using Sweet Search, a search engine designed to help students find reliable information.