The Size of Space

What is the size of space just to the nearest star? On a "feeling" or "emotional" level. That is important. If we don't know this, we simply don't know reality.

Recently, I was motivated to think about this by watching a long 3 1/2 hour youtube on getting a spaceship to a planet on one of the nearest stars to earth.

"(479) Interstellar voyage to find the Second Earth | Space Documentary 2020"
https://www.youtube.com/watch?v=cL2O-MyvtPs

Just for reference: Locations in this 3 1/2 hour video
14 min 28 sec Minerva mission log date Aug 14, 2157.
32 min 0 sec Kepler "telescope" looks for good candidate stars. NASA joins forces with MIT Lincoln Labs. Good survey of nearby Earth-like worlds
48 min ?57 the coronagraph mask (for looking at light from sun or star)
50 min 55 Steve Squyres Planetary scientist Cornell University
52 min 11 sec Minerva mission log Oct 4, 2157
52 min 23 sec & 53 min 10 sec - "I [Minerva] launch"
53 min 10 sec "My name is ? Atoman"
54 min 0 sec total distance to the planet 4.7 light-years, max speed 51,000 kilometers/sec, 49.8 years to reach destination (includes time for acceleration and later deacceleration).
54 min 51 sec Mission is simple: "Find Life"
55 min 0 sec Ever since a kid, Squyres maps of strange places. He realizes what he wants to do with the rest of his life.
57 min 50 sec Why not look beyond our solar system for life.
58 min 30 sec proxima centari is closest star (sun) (4.3 light years) that hosts an inhabitable planet
58 min 45 sec 170,000 times farther than Mars.
59 min 10 sec People who figure out how to do this, will be dead by the time the space ship gets there - cf the Great Cathedrals of Europe.
1 hr 0 min 48 sec I, Minerva, passes by little Voyager satellite that was launched ? 170 years earlier.
1 hr 1 min 41 sec. I, Minerva, will be having no more communication with Earth, and I retract my transmitter (the umbrella-like thing on the space ship)
1 hr 24 min 0 sec - look at methods of propulsion needed for interstellar space.