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One of the reasons why we've been able to achieve so much as a species is because we ask questions, correct? So, imagine this, how would the world be like today if we only asked questions like "What are we going to eat tonight" or "Should we go hunting to get our next meal?" If we asked questions like those, more than likely we'd have gardens and irrigation systems. We wouldn't have your iPhone that's sitting right next to you, or your 1080p HD TV in your living room. Asking questions like "What are your thoughts of traveling to Mars?" or "How can we improve technology?" are great questions that have improved our daily life. I'm in no shape or way telling you to not think big, but thinking big is great, and we all should think bigger.
Personally, I think one of the many things we should master is interstellar travel. I've always been advocate about interstellar travel, it's just something that amazes me. We've gotten far splitting atoms, how about fusing them together? Physicist and all other scienetific people have said this isn't possible. Well, technically it is possible. (Though it would take a lot of allocation and unification to make this even possible. You would have to think about how long can a human body be around non-gravity, how food would be, etc.) ― There is a scientific unit called Planck units. Which is a theoretical unit of power or energy needed to accelrate a particle to the point where it will go faster than the speed of light. To achieve the planck energy, you basically couldn't reach it with what we have today. So if you tried combining all of the nuclear power plants, you wouldn't be able to reach that amount. (it basically be like 1% of the Planck unit.) ― At this point we're thinking mundane because we really do not have a reference point. So, the answer would simply be fusion. (Fusing atoms) All of our power sources are fission base. What we would need is nuculear fusion. At that point we would be able to tap into or approaching to unlimited amounts of energy. Basically that's the next step to interstellar travel.
If you're not understanding any of this, there is a movie called WALL-E which basically has a ship called the Axiom. Basically, all of humanity was on that ship. Generations and generations have died on that ship to keep humanity. So, lets just we can travel the speed of light. We'd also have to quadruple light speed. So we would have to have very similar things like we have on Earth, just on a spacecraft. (It would have to be the size of Axiom I suppose) We would have to have gravity, we would have to have artificial sunlight, we would have to have everything perfect. ― At this point we would have to be traveling into galaxies, systems, or whatever. A place in mind that we would more than likely travel is the Alpha Centauri system. The closest habital zone is the star Sirius. Which I believe has a habitable goldilocks planet. According to Google, Sirius is 8.6 light years away from Earth.

One of the theroetical problems when doing this is the degeneration of the human body. Even with a artificial gravity source (which is what they would have to do) you sorta need a ring that would replicate a planet. Here's an example I drew on MSPaint:

So basically, we would have to have Chicago (obviously not that big) on a spacecraft. So we would have to have something similar like on WALL-E with the Axiom ship. Without that ring with the gravity, your body would just break. If you ever look into astronauts, they have to do countless exercises while they are in space. Why? Because their body slowly decays. (The human body was made for gravity, without it, it slowly decays.) So how many [xx] amount of years it would take to travel to Sirius, you would need this ring.
Here's some of the things that we would need:
a) We would need a city traveling at the speed of light.

c) Other artifical stuff that the human body needs.
d) Food
Do note that we would be traveling at the speed of light, so this is just completely mind boggling.
You're probably wondering or about to ask where would we get the money to do such thing? Well, we wouldn't need money. Money at this point is superficial and is only needed on Earth. The resources on the other hand? That's the main problem. We would basically have to be in a planet crisis where everything is falling apart. We also have to note that everything would have to be going 100%. If something gets messed up, we're doomed. But at the moment (today) we wouldn't have the time to do this. But if we fuse some atoms, we can get really far into this technology. ― A little joke is imagine if a car company got this kind of technology? It be like "You gotta put a damn hemmi in this son of a bitch to make that bitch go faster!" But, that's just a little side-joke. This isn't relating to this.
We also run into a few other problems is that when we're traveling the speed of light, nothing is resisting off of you. Stars would pull on you, but how would you break? You would have to plot your course and try to avoid any gravitational pull by the stars or such. But those stars would be useful because it would slow you down, so this completely just messes with my mind. ― Once you achieve that speed, a lot of the work has been done for you. You just have to operate it and keep it going. Again, theoretically speaking, it is possible to do this. It's just a matter of enormous amount of energy and the vehicle to do such thing. It's really insane. ― You also couldn't do any of this in a rocket ship, it would have to be like the Axiom off of WALL-E.
Well, I guess that's my little rant. I'm not going to summarize this, please do read and give me your responses.
Thanks!