There's a huge difference between sending humans to Mars and colonizing worlds outside our solar system.
SpaceX CEO Elon Musk wants to have a city of a million people on Mars by 2050. That may sound astronomically ambitious considering humans have never set foot on the Martian surface. But is it feasible? How long would it take for humans to colonize another planet? And could it ever be possible for people to colonize worlds outside the solar system?
Humanity will, however, likely reach Mars within decades. China plans to start sending human crews to Mars in 2033 , while NASA aims to send astronauts there by the late 2030s or early 2040s. Once humans get there, the next step could be to build a colony. Colonization implies some degree of self-sufficiency but not necessarily complete independence from Earth. Saydam compares Mars with a remote island where you'd still need to import things occasionally.
"The closest exoplanet would take several tens of thousands of years to reach with our current technology," Frédéric Marin , a black hole astrophysicist at the Astronomical Observatory of Strasbourg at the University of Strasbourg in France, told Live Science.
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