
Originally Posted by
Immortal Soldier
You are mistaken sir,
You are correct, speed of light is impossible (under current physics laws). But even Einstein said that (anything that travels the speed of light would have so much mass that it wouldn't be able to move), to do inter-stellar travel you would only need to reach 80-90% the speed of light. And remember anything inside the ship that is going the speed of light ages significantly less, so spending a year in a ship going 90% the speed of light translates to 10-20+ years on Earth. Crazy stuff, but is backed by physics.
Human's are an ignorant bunch, no offense you are a prime example "we would have known by now if light travel was possible"? Oh yeah coming from a civilization that 150 years ago didn't even have propeller airplanes let alone a space flight? We are not as advanced as we think we are, just because we have Ipads does not make us an advanced civilization in the universes eyes. We cannot effectively manage our own planet's health and we are using fuel technology that dates back to the dinosaurs. We will never understand the universe completely because 1) We will go extinct by that time 2) We cannot mentally comprehend that level of understanding nor could any computer alive today, even Watson.
There are physics laws that we have still not yet discovered that will greatly change how we view our universe and impact inter-stellar space travel. Theoretical physicist know that theoretically there can be multiple universes, which means theoretically we could enter those universes when this universe dies out. However, to reach that point of advancement we need to understand the basics, we still don't know why there isn't an equal of anti-matter to matter in this universe.
A ignorant human belief is that a civilization advanced enough to do inter-stellar is a civilization that also wastes resources. Just because we humans cannot efficiently manage our resources does not mean that civilizations that our thousands of years more advanced than us are the same. In fact, one can argue because they reached that level of advancement they had to be able to effectively manage resources or else they would have imploded.
It's not hard for a civilization to detect us we have been sending out radio signals for hundreds of years, we are bulls-eye. But they have technologies and resource gather options that we have still yet to understand (we are just attempting to build a fusion reactor) such as asteroid mining.
If a civilization does visit the chances they will be friendly are slim, the friendly one's do not interfere in our life and the bigger concept to understand is the "God civilizations" also known as "intelligent creation". The God civilizations would be one of the first civilizations that managed to survive to this day and be one of the most advanced in the entire universe (they may have even come from other universes), to promote growth in the galaxy these God Civilizations "aid" potential intelligent civilizations in their growth. If you look at history many scholars think the Mayans and Egyptians could not build the structures they did without advanced knowledge of architecture that was ahead of their time.
Anyway, these civilizations promote growth and may even like a "god" create life itself on other planets in order to ensure survival of life in the Universe. In order to prevent the so called "alien nations destroying other alien nations" they probably intervene if any of their creations or any competing civilizations try to declare war on a sovereign civilization.
There are a lot of factors that go into play and it would take to long to describe them all, think of it is as extra-stellar philosophy. Not everything is as simple as Civilization A becomes super advanced and attacks less advanced civilization B and C. It's more complicated than that.