(left) Brain

I think this video could explain it to you. It is an animation based on Hubble and computing calculations, because the fact is really slow, so we can’t “record” it. The nearest galaxies (one each other) are separated about 200.000 light years.

Aurora Borealis
Do you know what is it? Auroras, sometimes called the northern and southern [...]

Janna Levin, a professor of physics and astronomy at Barnard College of Columbia University, narrates this two-minute video about The Big Bang. Watch it in high definition here.
via Boing Boing

This video tries to explain you in the more pedagogical way, how to visualize, starting from first, up to ten dimensions. Personally, I don’t think it is the best, but just a curious way to figure it out.

via alt1040