The Cosmic Ladder That Lets Us Map the Universe

From SciShow Space.

Considering how massive our universe is, we know the distances to cosmic objects surprisingly well. What tools and clues do scientists use to measure distances that are so enormous they sound like made-up numbers?

Hosted by: Reid Reimers

SciShow has a spinoff podcast! It’s called SciShow Tangents. Check it out at http://www.scishowtangents.org
———-
Support SciShow by becoming a patron on Patreon: https://www.patreon.com/scishow
———-
Huge thanks go to the following Patreon supporters for helping us keep SciShow free for everyone forever:

Bd_Tmprd, Harrison Mills, Jeffrey Mckishen, James Knight, Christoph Schwanke, Jacob, Matt Curls, Sam Buck, Christopher R Boucher, Eric Jensen, Lehel Kovacs, Adam Brainard, Greg, Ash, Sam Lutfi, Piya Shedden, Scott Satovsky Jr, Charles Southerland, charles george, Alex Hackman, Chris Peters, Kevin Bealer

———-
Like SciShow? Want to help support us, and also get things to put on your walls, cover your torso and hold your liquids? Check out our awesome products over at DFTBA Records: http://dftba.com/scishow
———-
Looking for SciShow elsewhere on the internet?
Facebook: http://www.facebook.com/scishow
Twitter: http://www.twitter.com/scishow
Tumblr: http://scishow.tumblr.com
Instagram: http://instagram.com/thescishow
———-
Sources:
https://books.google.com/books?id=0H0fjBeseVEC&pg=PA34#v=onepage&q&f=false
https://link.springer.com/article/10.1007/BF00329826
http://spiff.rit.edu/richmond/asras/measure_ss/measure_ss.html
https://astro.unl.edu/naap/distance/distance.html
http://adsabs.harvard.edu/full/1962AJ…..67..181P
https://www.lpi.usra.edu/lunar/missions/apollo/apollo_11/experiments/lrr/
https://phys.org/news/2015-01-distance-sun.html
https://phys.org/news/2014-05-distance-moon.html
https://blogs.esa.int/venustransit/2012/05/30/measuring-the-size-of-the-solar-system-parallax/
https://lco.global/spacebook/distance/parallax-and-distance-measurement/
https://lco.global/spacebook/light/redshift/
https://www.indiebound.org/book/9780375713453
https://usm.maine.edu/planet/how-did-astronomers-determine-cepheid-brightness-depends-their-periods-wouldnt-they-have-had
https://physicstoday.scitation.org/doi/full/10.1063/PT.3.1348
https://pdfs.semanticscholar.org/61f9/f419bbbb46424c1e215bae5cfc82452210b4.pdf [PDF]
https://www.noao.edu/staff/shoko/tf.html

Image Sources:
https://images-assets.nasa.gov/image/iss034e054858/iss034e054858~large.jpg
https://commons.wikimedia.org/wiki/File:Andromeda_Galaxy_(with_h-alpha).jpg
https://www.nasa.gov/multimedia/imagegallery/image_feature_1768.html
https://svs.gsfc.nasa.gov/10145
https://svs.gsfc.nasa.gov/13578
https://commons.wikimedia.org/wiki/File:M101_hires_STScI-PRC2006-10a.jpg