Humanity has really only been detectable for about 100 years. (Broadcasting radio that can penetrate the atmosphere, creating enough light, or enough pollution to be set from space.) at the speed of light that means aliens would have to be within 100ly of earth to have detected us by now. There are only a few hundred stars within that distance. The assumption that intelligent alien life exists is essentially a math problem. Hundreds of billions of stars within potentially trillions of planets, that’s a lot of chances for there to be intelligent life. That said with the limited scope of a few hundred systems it’s not really a possibility that we’d have been detected yet unless they were already monitoring our planet…oh shit ancient aliens… /s
Humanity has really only been detectable for about 100 years. (Broadcasting radio that can penetrate the atmosphere, creating enough light, or enough pollution to be set from space.) at the speed of light that means aliens would have to be within 100ly of earth to have detected us by now. There are only a few hundred stars within that distance. The assumption that intelligent alien life exists is essentially a math problem. Hundreds of billions of stars within potentially trillions of planets, that’s a lot of chances for there to be intelligent life. That said with the limited scope of a few hundred systems it’s not really a possibility that we’d have been detected yet unless they were already monitoring our planet…oh shit ancient aliens… /s