More than 40 years after the final Apollo missions, it's prime time for deep space travel again, and Mars is in our sights, Tabitha M. Powledge writes: "There’s a planet that’s truly nearby, one that with some work could sustain life-as-we-know it, one with water and enough sunlight for food crops, one that, with some improvements in current spacecraft technologies, we could get to after a journey of only nine months or so and within the lifetimes of most of us."
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