Size of Universe and Relative Planet Sizes

httpv://www.youtube.com/watch?v=b0lxbzgwW7I&NR=1

Try in some small way to fathom the size of the universe. And here’s the related size of planets and stars:

httpv://www.youtube.com/watch?v=HEheh1BH34Q

And it’s always a good time for a refresher to view Carl Sagan’s COSMOS:

httpv://www.youtube.com/watch?v=_3NAW1U-swc

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