Which paragraph from the article explains why the ultracool dwarf star discovery is so significant to the search for other signs of life? a Ultracool dwarfs make up about 15 percent of the astronomical objects in our immediate neighborhood, but until now, no one had ever discovered a planet orbiting one.

b “Systems around these tiny stars are the only places where we can detect life on an Earth-sized exoplanet with our current technology,” Gillon said in a statement. “If we want to find life elsewhere in the Universe, this is where we should look.”

c Going forward, the authors plan to use even more powerful telescopes to analyze the TRAPPIST-1 system. The Hubble Space Telescope will point its powerful lens toward the ultracool dwarf star.

d The system’s host star, called TRAPPIST-1, is what is known as an ultracool dwarf. It is about one-tenth the size of our sun and just a bit bigger than Jupiter.