Would aliens in other galaxies develop optical and radio telescopes to explore the universe?
Possibly, it would depend a lot on how they view the environment around them. For instance, it would make no sense for them to build a telescope that sees visible light, if they can only see in ultraviolet. Or, it might not be wise for them to build devices that emit radio waves on purpose if they happen to be severely damaged or injured by radio waves. An alien civilization may build mainly ultraviolet or infrared telescopes if that’s how they happen to view their environment. They might use microwaves to communicate electronically instead of radio waves so they might build a microwave telescope of some kind. It is important not to assume that any advanced alien species must observe or interact with their environment the same as we do. That would be an incredibly short-sighted assumption. We have creatures here on Earth that are able to use electromagnetic fields to navigate, such as birds. We have creatures on Earth that must breathe air, yet they live in the water instead. On some p
