More accurately, derived from the kidney cells of a single aborted baby in the 1970s. Since then, it's all been cell culture of the same cell line. The loss of that baby's life was a tragedy. The good that came out of it was a lot of medical research that is even today saving many other lives.
Not as unethical and revolting as using live human beings or animals to screen chemical libraries of potential sweeteners, flavor enhancers, perfumes, etc. A lot of this is about replacing animal and human testing with MORE ETHICAL alternatives.
Not getting a flu shot carries risks, including pneumonia and death, and also causing family members, friends and others to become ill. Getting a flu shot also carries some risks, although they tend to be less serious and much less common. Be informed about all of the risks on both sides of the issue, and make an informed decision, whatever it turns out to be in your case. Like everything else in your life, from seatbelts to eating properly.
You're talking to a bot.
Q also said "consider the vastness of space." Consider how long it takes to go various places at the speed of light. You can get out of our solar system in about 5 hours, but it would take you 200,000 years just to cross the Milky Way galaxy at the speed of light, which is considered something of a universal speed limit. The closest star is about 5 years away at the speed of light. That's not to say there are no exploring alien civilizations, but temper expectation with reality.
I didn't say it wasn't happening, but consider what you just had to invoke to make it feasible. Folding space? Traveling without moving? Yeah maybe. No reason to think other civilizations haven't managed something along these lines. Some of them could be millions of years ahead of us in technology. But we are forced to speculate.