EXPLORING MARS - Scientific American Editors - Bog

"Since the first Mars-bound probes were launched in the 1960s, the planet has intrigued scientists and the public alike due to its potential for human habitability. However, despite its many similarities to Earth, so far there has been no conclusive evidence that life has existed on Mars. Although no human has actually traveled to the planet, the scientific community has extensively studied its geology, climate, and history."--