Why is interstellar space travel not the primary focus?

On Aug. 25, 2012, Voyager 1 flew beyond the heliopause and entered interstellar space, making it the first human-made object to explore this new territory. At the time, it was at a distance of about 122 AU, or about 11 billion miles (18 billion kilometers) from the sun. read more

Because: it’s generally perceived as being very hard to do. It’s generally perceived as being very, very expensive to do. It takes a very long time to do. Humans tend not to be attracted to multi generational projects. read more

In May 2016, researchers using the Transiting Planets and Planetesimals Small Telescope (TRAPPIST) in Chile found not just one but seven Earth-sized exoplanets in the habitable zone. Meanwhile, in space, NASA’s Kepler spacecraft is designed specifically for this purpose and has already identified over 2,000 exoplanets. read more

Do you think interstellar travel is possible (by any civilization). It seems to me that all possible solutions are one way trips. When it comes to interstellar travel, I definitely do think it's possible. But there definitely are constraints, dependent on how we're willing to do it. read more