In recent years, astronomers have found thousands of planets orbiting nearby stars, making the old science-fiction trope of off-world colonies seem a bit less absurd.

In recent years, astronomers have found thousands of planets orbiting nearby stars, making the old science-fiction trope of off-world colonies seem a bit less absurd. https://t.co/82pUKhMe32

— NBC Nightly News with Lester Holt (@NBCNightlyNews) August 14, 2018