25:04
How Large is the Universe?
1:05:54
Fermi Paradox - Where are all the aliens?
19:03
The Living Universe is Unimaginably BIG and You're a Part of it!
30:01
A Journey to the End of the Universe
10:22
How Big Is Our Galaxy?
26:33
Let's reproduce the calculations from Interstellar
7:07
To Scale: THE SOLAR SYSTEM
25:23