I find this timeline to be very interesting, however I have few notes/questions:
- Isn't the evolution of humans too fast (<2500s)? I mean even when Star People lived in Jovian system and beyond and everyone else on Earth and closer to Sun, the changes wouldn't be so drastic right? 20 percent more brain size in 400 years is too much of a change. I read somewhere that even in 100 000 years we will probably look pretty much the same. Unless these changes were done via genetic engineering, that would explain it.
Yes, it was mostly done by genetic engineering.
- Dyson sphere. I love the concept, I really do. Is there actually enough material in our solar system to build one, and does that mean humans invented artificial gravitation along the way? This also involves the space ships.
It's definitely possible if you mine the sun. I don't know whether it would be possible if you just break up the planets.
- Alcubierre (Warp) drive seems to be developed way too late. And speed of light isn't very practical, even when relativity kicks in, and it's not like you can just jump to and out of light speed. Unless ofcourse inertial dampeners are invented.
I'd actually predict that they'll be invented in the 4th millennium, but for the sake of the story, I didn't want the star people getting out of the galaxy too fast. In-universe, they discovered a way to build warp drives, but the energy requirements made building one impractical for thousands of years.
- The Core Empire. So they were about the same tech level as Star People, but the Dyson spheres they builded were empty or occupied by some "lesser" civilizations, I guess that means The Core Empire was "good"? They cared about all life?
The Core Empire did in fact look out for lower civilizations. Whether they are "good" or not depends on who you ask. Ask the Core Empire and they would say that they are a peaceful and powerful empire and a safe haven for all sentient races. Ask the Star People and they would tell you that they are a petty bureaucracy doing nothing for the good of the universe. You see, whenever a civilization "grew up" sufficiently they would get representatives in the empire's government. Over time, there came to be hundreds of different civilizations with wildly different and incompatible ideas on how to run things. This led to perpetual squabbling and enormous numbers of complex rules had to be implemented, leading to a tangled bureaucracy that could accomplish nothing save for maintaining the status quo. Stagnation followed, leading to a large hodgepodge of civilizations sitting on a huge pile of resources and doing nothing with it for millennia. There was talk of establishing a leader civilization to command the entire Galactic Core and clean up the mess, but as almost everyone wanted to be the leader (and many even honestly believed that they were the best species for the job), nothing came of it.
- And out of curiosity, if all stars in the galaxy have Dyson sphere around it, how it would look like. Would it reflect light from other galaxies, or it would just look like gray cloud or something?
With visible light, I imagine it would be dark. Nothing would be visible to the unaided (human) eye since the spheres aren't transparent. With infrared, on the other hand, the heat signatures of every sphere could be clearly seen.