From The Science Asylum.
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We can’t measure the distance to astronomical objects directly, so we have to be creative. That’s why we need the cosmic distance ladder. It’s a serious of techniques we use to calculate astronomical distances indirectly.
Nick Lucid – Host, Writer, Editor, Animator
Em Lucid – Producer
Nora Bailey – Researcher, Fact-Checker
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VIDEO ANNOTATIONS/CARDS
Black Hole Misconceptions:
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RELATED YOUTUBE VIDEOS
SciShow Space on Distance Ladder:
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HUGE THANK YOU TO THESE SUPPORTERS
Asylum Counselors:
Bosphorus
Asylum Orderlies:
Dhruv Singhal, Medec Hurtz
Einsteinium Crazies:
Benjamin Sharef, Eoin O’Sullivan, Jonathan Lima, Joseph Salomone, Kevin Flanagan, Sean K, YouTubeviewer2014
Plutonium Crazies:
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Clayton Bruckert, David Johnston, Jonathan Reel, Joshua Gallaghe, Marino Hernandez, Mikayla Eckel Cifrese, Mr. Orn Jonasar, Olga Cooperman, Thomas V Lohmeier
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SOURCES
Radar Ranging:
https://doi.org/10.1016/0019-1035(73)90002-X
https://ilrs.gsfc.nasa.gov/science/scienceContributions/lunar.html
Parallax:
https://doi.org/10.1167/9.1.10
https://sci.esa.int/web/gaia/-/53278-measuring-stellar-distances-by-parallax
https://www.esa.int/Science_Exploration/Space_Science/Gaia/Gaia_factsheet.
https://doi.org/10.3847/1538-3881/aacb21
Cepheid Variables:
http://astro.wku.edu/labs/m100/PLrelation.html
https://www.atnf.csiro.au/outreach/education/senior/astrophysics/variable_cepheids.html
https://doi.org/10.17226/9585
https://doi.org/10.1086/126870
Type 1a Supernovas:
https://arxiv.org/abs/0705.0726
https://doi.org/10.1086/186970
https://doi.org/10.1146/annurev.aa.30.090192.002043
https://arxiv.org/abs/1608.04192
Cosmological:
https://astro.ucla.edu/~wright/CosmoCalc.html
https://arxiv.org/abs/astro-ph/9905116
https://doi.org/10.1093/astrogeo/aty268
https://iopscience.iop.org/article/10.3847/2041-8213/ac9b22
https://arxiv.org/abs/2208.13642
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LINKS TO COMMENTS
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IMAGE/VIDEO CREDITS
Apollo Retrorefector:
https://commons.wikimedia.org/wiki/File:Apollo_11_Lunar_Laser_Ranging_Experiment.jpg
Deep Field Flythrough:
https://svs.gsfc.nasa.gov/31035/
Gaia Animation:
https://www.esa.int/ESA_Multimedia/Videos/2019/10/Gaia_astronomical_revolution
Milky Way (Artist Rendition):
https://images.nasa.gov/details/PIA10748
Type 1a Supernova:
https://svs.gsfc.nasa.gov/13852
https://commons.wikimedia.org/wiki/File:Record-breaking_supernova_in_the_CANDELS_Ultra_Deep_Survey.jpg
Barred Spiral Galaxy (NGC 1300):
https://images.nasa.gov/details/GSFC_20171208_Archive_e002154
Redshift Cube:
https://svs.gsfc.nasa.gov/14105/
Redshift Zoom:
https://svs.gsfc.nasa.gov/14301/
Galaxy GLASS-z12:
https://commons.wikimedia.org/wiki/File:NASA-GLASS-z13-Closeup-JWST-20220722.jpg
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TIME CODES
00:00 Cold Open
00:22 Introduction
02:05 Radar Ranging
04:17 Inverse Square Law
04:57 Stellar Parallax
08:46 Standard Candles
10:58 Cepheid Variable Stars
12:58 Type 1a Supernovas
15:15 Cosmological Redshift
18:37 Summary
19:44 Nebula Ad
20:52 Outro
21:05 Featured Comment
