1WholeHouseLibrary
A friend sent this link to me: http://uploads.ungrounded.net/525000/525347_scale_of_universe_ng.swf
It's your basic Powers of Ten, but with more examples and details. Enjoy!
It's your basic Powers of Ten, but with more examples and details. Enjoy!
5proximity1
Here's a good, clear exposition in layman's terms of the problematic aspects of measurement and its limits when it comes to astrophysics on vast extra-galactic scales.
For example, from the article, our universe is merely the observable part. It's estimated to be about 13.8bn light-years across. But because the universe is expanding and has been all during that time, the expansion has to be estimated and added to that space-time. The result adds another 31.2bn light-years--more than twice the base figure.
Big space | Our planet is a tiny porthole, looking over a cosmic sea. Can we learn what lies beyond our own horizons of perception? | by Katie Mack | Aeon |
31 July 2020
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"This Essay is based on Katie Mack’s forthcoming book, The End of Everything: (Astrophysically Speaking) , publishing on 4 August 2020 by Scribner."