For example if the Betelgeuze system had a planet, with a theoretical large telescope on that planet and looked back at earth. It would see life and civilizations from the 15th century a.d. (~500 light years distance)
For example if the Betelgeuze system had a planet, with a theoretical large telescope on that planet and looked back at earth. It would see life and civilizations from the 15th century a.d. (~500 light years distance)
Earth like just means it’s the right size, in the right spot away from a star (in what’s known as the habitation zone) that it could maybe possibly support the life we know about here on Earth. It does not mean it is actually like Earth.
All we can really “see” about them other than their position, is the elemental makeup by looking at the wavelengths of light bouncing off it and that can tell us things like that it might have a nitrogen-oxygen rich atmosphere. But we don’t know if there are plants or animals or any kind.