Could alien signals have already reached Earth undetected?

Astronomers have searched the skies for signs of extraterrestrial technology for decades. These searchers since 1960 have ...
Futurism

This Is How Big a Telescope Aliens Would Need to See Dinosaurs on Earth

Being able to spot the Earth, let alone any signs of life on our planet, would require an enormous telescope from 66 million ...
Scientific American

Could aliens in another galaxy see dinosaurs on Earth?

How big would a telescope need to be to see Earth’s dinosaurs from 66 million light-years away? Think big—and then think ...

If alien signals have already reached Earth, why haven't we seen them?

For decades, scientists have searched the skies for signs of extraterrestrial technology. A study from EPFL asks a sharp question: if alien signals have already reached Earth without us noticing, what ...