The speed of light is 299,792,458 meters per second. That's an incredibly fast speed. But how did we even figure that out in the first place? And how do we even know it that accurately?

Part 2 Why can’t anything go faster than the speed of light?    • Why can’t anything go faster than the...  

My phases of the Moon necklace is from Eclectic Eccentricity, who have a great selection of spacethemed jewellery: https://eclecticeccentricity.co.uk/pr...



More details on measuring the speed of light (or really, the length of a meter!) with your microwave: https://physicamechanica.wordpress.co...

Here are links to the papers mentioned:

Rømer (1667) https://gallica.bnf.fr/ark:/12148/bpt...
Huygens (1677) https://gallica.bnf.fr/ark:/12148/bpt...
Newton (1704) https://gallica.bnf.fr/ark:/12148/bpt...
Bradley (1729) https://royalsocietypublishing.org/do...
Fizeau (1849) https://onlinelibrary.wiley.com/doi/a...
Weber & Kohlrausch (1856) https://onlinelibrary.wiley.com/doi/e...
Maxwell (1864) https://upload.wikimedia.org/wikipedi...
Essen (1950) https://www.jstor.org/stable/pdf/9843...
Evenson et al. (1972) https://journals.aps.org/prl/pdf/10.1...


"Space: 10 Things You Should Know": http://bit.ly/SpaceDrBecky

US & Canada version: "Space at the speed of light" (same book, different title): https://www.penguinrandomhouse.com/bo...

German translation "Das kleine Buch vom großen Knall" : https://www.dtv.de/buch/beckysmethur...



Royal Astronomical Society podcast that I’m cohosting podfollow.com/supermassive



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Dr. Becky also presents videos on Sixty Symbols:    / sixtysymbolsand   Deep Sky Videos:    / deepskyvideos  



‍ Dr Becky Smethurst is an astrophysicist researching galaxies and supermassive black holes at Christ Church at the University of Oxford.
http://drbecky.uk.com
https://rebeccasmethurst.co.uk