Earth will not live forever. Whether its destruction comes as the result of cosmic inevitability or human-caused cataclysm, the planet will eventually meet its demise. Though that may be billions of years from now, Chris Mason in his book “The Next 500 Years,” argues humans have a more obligation to do what they can ensure life from Earth can extend beyond the planet. Mason, principal investigator on NASA’s twins study and a professor at Weill Cornell Medicine, discussed the effects of space on the human body, how it may be possible to genetically engineer human and other life forms to thrive in environments less hospitable than Earth through the use of new genetic tools, and the ethical considerations around these issues.