Theoretically yes, but you would need a very large telescope to resolve individual organisms at the distance of one or more light years. The Rayleigh criterion

Theoretically yes, but you would need a very large telescope to resolve individual organisms at the distance of one or more light years. The Rayleigh criterion gives us a minimum diameter of 1.22 * wavelength / angle, and the angle to resolve 1 meter at 1 ly is approximately 1.06e-16 radians. So for 508 nm visible (sun)light the minimum diameter would be ~5.86e9 meters (or a little more than 919 Earth radii) per light year. https://en.wikipedia.org/wiki/Angular_resolution#Explanation https://en.wikipedia.org/wiki/Angular_resolution#Explanation