The nearest exoplanet is just 4 light-years away, but it's hard to study because it doesn't transit (or cross the face of) its star to our view. Proxima b is probably a rocky world under an orange-red sun, with two neighboring stars bright in the sky. https://go.nasa.gov/3mEJ46M #NASAExoplanets
Proxima b, an Earth-size planet right outside our solar system in the habitable zone of its star, may not be able to keep a grip on its atmosphere, leaving the surface exposed to harmful stellar radiation.
