Space Mog | Astronomical distances: How do we know how far away galaxies are? @SpaceMog | Uploaded 3 years ago | Updated 17 hours ago
Hi Spacecats, I'm Dr Maggie Lieu and welcome to my channel, where you can find all things space, astronomy and physics! Have you ever wondered how astronomers know how far away things are? It turns out the the method they use to determine an astronomical object's distance, depends on what it is!

Extra reading:


Media credits:
Variable star: NASA/ESA/KORNMESSER
Universe expansion: Kornmesser/Calcada/NASA/ESA/HUBBLE
Redshift: ESO


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