What I am told by star people through many channeling sessions, in good agreement with other channels and sources is that our Universe is very well populated. Most planets have civilizations at various levels of development. Our civilization is relatively young. Advanced civilizations don't have to fly, they are capable of jumping the space between the stars with ease, using their ships. The Earth is not the only civilization under quarantine. Most civilizations live for a while under a quarantine until they are ready for open contact. It is typical for a civilization to go through a period of wars and face a possibility of suicide; this is why advanced technologies are not given to civilizations like ours. Once a civilization learns to communicate via telepathy and unites, its suicidal abilities subside and it reaches a state of unity allowing, it to shift to a higher dimensional level. Typically, advanced civilizations of the universe are altogether on a higher dimensional level usually referred to as 4th density or 4th dimension. I shall talk about dimensions in detail later. For now, just keep in mind that star people who reach us are from another dimensional level, they are not even from our material reality. That is why they appear to us as "energies" and not physically. They could materialize temporarily to be with us, but this is not permitted by the quarantine. They only are permitted to speak to us via channelers or directly in telepathic messages, dreams and visions. That is how things are. I wish very much to speak to them in person.
The star people of our dimensional level are similar to us and usually don't have a technology to reach us.