Margaret J. Goldstein 
Investigating Mars [EPUB ebook] 

Are there signs of life on Mars? What is on the Martian surface? Scientists have made great strides in investigating Mars. Using rovers and orbiters, they’ve learned about the planet and how to improve the technology they use to explore it. Get a glimpse of the history of exploring Mars, the discoveries scientists have made so far, and how human explorers might continue the investigation.