Some of those seven Earth-sized planets orbiting TRAPPIST-1 may represent our best chance ... because they are in the so-called "habitable zone" of their dim star -- meaning that liquid water ...
The TRAPPIST-1 system is a science-fiction writer's dream. Seven Earth-sized worlds orbit a red dwarf star just 40 light-years away. Three of those worlds are within the habitable zone of the star.
However, none of this is a sure thing. Figuring out the habitable zone of a dwarf star isn't exactly easy. Because TRAPPIST-1 and stars of its ilk are much smaller and dimmer than our sun ...
If you are going to look for intelligent life beyond Earth, there are few better candidates than the TRAPPIST-1 star ... them are in the potentially habitable zone of the star.