Alien life search narrows as red dwarf star systems may be inhospitable

Red dwarf stars are the most common in the universe.

Illustration of a red dwarf star orbited by a hypothetical exoplanet. Red dwarfs erupt with intense flares that could strip a nearby planet's atmosphere over time, or make the surface inhospitable to life as we know it. Credit: NASA/ESA/STScI/G. Bacon.