The first exosolar planet (a planet orbiting a star other than the Sun) was discovered in 1995, and since then humans have found over 3600 planets outside of our solar system. Some of those found are orbiting not one star like we do, but two stars. For example, stars Kepler-35A and 35B orbit each other, but a planet Kepler-35b, orbits both of them. This is much more like the fantasy word Tatooine in the space epic Star Wars than our own planet Earth. In A New Hope, we see young Luke Skywalker

A newly discovered exoplanet, LHS 1140b, is being called the "best place to look for signs of life beyond the Solar System." The reason is because of a confluence of factors: the planet is likely rocky, orbits a relatively quiet star, passes in-front of its star from Earth's point-of-view every 25 days, and likely has an atmosphere. At the moment, studying that atmosphere in detail is not possible; however, with the next generation of telescopes coming online in the coming years (TMT, ELT, JWST)

Late last year, Elon Musk gave a talk at the 67th International Astronautical Congress outlining why he believes humans need to be a multi-planetary species, and how he plans to do it. Musk's talk, which you can watch here , has also been transcribed into this helpful document. This is a plain-language description of putting humans on Mars written by one of the leaders in the game. It's worth a read (or a watch).

NASA recently released a more in-depth look at its missions beyond low-Earth orbit. The whole vision is being dubbed the 'Journey to Mars:' a 2 phase program designed to step further and further way from Earth. The first phase will place a space station in lunar orbit. The second phase will see humans launching off to the red planet.